From 448c0a8702b96a7ad2bbffbe98a937766c9fb27c Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Wed, 19 Feb 2020 11:42:29 -0500
Subject: [PATCH 01/10] attempt to replace nose with pytest

---
 .circleci/config.yml           |  2 +-
 packages/python/plotly/tox.ini | 24 ++++++++++++------------
 2 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 5e58717cc4a..b02e989c310 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -339,7 +339,7 @@ jobs:
           command: |
             cd packages/python/plotly
             locale
-            tox -e py37-core -- -a '!nodev'
+            tox -e py37-core -- -k 'not nodev'
           no_output_timeout: 20m
       - run:
           name: Commit
diff --git a/packages/python/plotly/tox.ini b/packages/python/plotly/tox.ini
index df41b7e1df1..90f239cc12f 100644
--- a/packages/python/plotly/tox.ini
+++ b/packages/python/plotly/tox.ini
@@ -81,25 +81,25 @@ deps=
 basepython={env:PLOTLY_TOX_PYTHON_27:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_core
 
 [testenv:py35-core]
 basepython={env:PLOTLY_TOX_PYTHON_35:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_core
 
 [testenv:py36-core]
 basepython={env:PLOTLY_TOX_PYTHON_36:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_core
 
 [testenv:py37-core]
 basepython={env:PLOTLY_TOX_PYTHON_37:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_core
 
 ; OPTIONAL ENVIRONMENTS
 ;[testenv:py27-optional]
@@ -116,8 +116,8 @@ commands=
 basepython={env:PLOTLY_TOX_PYTHON_27:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
-    nosetests {posargs} -x plotly/tests/test_optional
+    pytest {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_optional
     pytest _plotly_utils/tests/
     pytest plotly/tests/test_io
 
@@ -125,8 +125,8 @@ commands=
 basepython={env:PLOTLY_TOX_PYTHON_35:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
-    nosetests {posargs} -x plotly/tests/test_optional
+    pytest {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_optional
     pytest _plotly_utils/tests/
     pytest plotly/tests/test_io
 
@@ -134,8 +134,8 @@ commands=
 basepython={env:PLOTLY_TOX_PYTHON_36:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
-    nosetests {posargs} -x plotly/tests/test_optional
+    pytest {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_optional
     pytest _plotly_utils/tests/
     pytest plotly/tests/test_io
 
@@ -143,7 +143,7 @@ commands=
 basepython={env:PLOTLY_TOX_PYTHON_37:}
 commands=
     python --version
-    nosetests {posargs} -x plotly/tests/test_core
-    nosetests {posargs} -x plotly/tests/test_optional
+    pytest {posargs} -x plotly/tests/test_core
+    pytest {posargs} -x plotly/tests/test_optional
     pytest _plotly_utils/tests/
     pytest plotly/tests/test_io

From 39a539dedbefb5f958b18a35fea82882bef47083 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Wed, 19 Feb 2020 14:19:54 -0500
Subject: [PATCH 02/10] removed nose from test requirements

---
 packages/python/plotly/tox.ini | 1 -
 1 file changed, 1 deletion(-)

diff --git a/packages/python/plotly/tox.ini b/packages/python/plotly/tox.ini
index 90f239cc12f..268c1a2aecd 100644
--- a/packages/python/plotly/tox.ini
+++ b/packages/python/plotly/tox.ini
@@ -53,7 +53,6 @@ deps=
     coverage==4.3.1
     decorator==4.0.9
     mock==2.0.0
-    nose==1.3.7
     requests==2.12.4
     six==1.10.0
     pytz==2016.10

From 00ace7242a0dd198dd11a278eb57e0adf643d50e Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Thu, 20 Feb 2020 19:36:19 -0500
Subject: [PATCH 03/10] replace nose with pytest

---
 .../test_core/test_tools/test_get_embed.py    |  6 +--
 .../test_matplotlylib/test_plot_mpl.py        | 13 ++---
 .../tests/test_plot_ly/test_file/test_file.py |  2 -
 .../test_get_figure/test_get_figure.py        |  6 ---
 .../test_get_requests/test_get_requests.py    |  7 ---
 .../tests/test_plot_ly/test_grid/test_grid.py | 10 ----
 .../test_plot_ly/test_image/test_image.py     |  2 -
 .../tests/test_plot_ly/test_meta/test_meta.py |  3 --
 .../test_plot_ly/test_plotly/test_plot.py     |  5 --
 .../mplexporter/tests/test_basic.py           |  4 +-
 .../test_core/test_colors/test_colors.py      |  1 -
 .../test_move_delete_traces.py                | 10 ++--
 .../test_figure_messages/test_on_change.py    | 18 +++----
 .../test_validate_no_frames.py                | 15 +++---
 .../test_graph_objs/test_annotations.py       |  2 -
 .../test_graph_objs/test_append_trace.py      | 19 ++++---
 .../test_graph_objs/test_constructor.py       | 18 +++----
 .../test_core/test_graph_objs/test_data.py    |  7 ---
 .../test_graph_objs/test_error_bars.py        |  1 -
 .../test_graph_objs/test_figure_properties.py | 51 ++++++++++---------
 .../test_core/test_graph_objs/test_frames.py  |  4 +-
 .../test_graph_objs/test_layout_subplots.py   | 11 ++--
 .../test_properties_validated.py              | 30 +++++------
 .../test_core/test_graph_objs/test_scatter.py |  1 -
 .../test_graph_objs/test_template.py          | 28 +++++-----
 .../test_core/test_offline/test_offline.py    |  4 +-
 .../test_matplotlylib/test_annotations.py     |  4 +-
 .../test_matplotlylib/test_axis_scales.py     |  4 +-
 .../test_matplotlylib/test_bars.py            | 10 ++--
 .../test_matplotlylib/test_data.py            | 11 ++--
 .../test_matplotlylib/test_date_times.py      |  4 +-
 .../test_matplotlylib/test_lines.py           |  6 +--
 .../test_matplotlylib/test_scatter.py         |  7 ++-
 .../test_matplotlylib/test_subplots.py        |  4 +-
 .../test_offline/test_offline.py              |  7 ++-
 .../test_optional/test_utils/test_utils.py    |  4 +-
 packages/python/plotly/pytest.ini             |  5 ++
 37 files changed, 147 insertions(+), 197 deletions(-)
 create mode 100644 packages/python/plotly/pytest.ini

diff --git a/packages/python/chart-studio/chart_studio/tests/test_core/test_tools/test_get_embed.py b/packages/python/chart-studio/chart_studio/tests/test_core/test_tools/test_get_embed.py
index bbb6499fcae..77709176e50 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_core/test_tools/test_get_embed.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_core/test_tools/test_get_embed.py
@@ -2,7 +2,7 @@
 
 from unittest import TestCase
 
-from nose.tools import raises
+import pytest
 
 import chart_studio.tools as tls
 from _plotly_utils.exceptions import PlotlyError
@@ -13,10 +13,10 @@ def test_get_valid_embed():
     tls.get_embed(url)
 
 
-@raises(PlotlyError)
 def test_get_invalid_embed():
     url = "https://plot.ly/~PlotBot/a/"
-    tls.get_embed(url)
+    with pytest.raises(PlotlyError):
+        tls.get_embed(url)
 
 
 class TestGetEmbed(TestCase):
diff --git a/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py b/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
index ac352928465..e1c89017026 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
@@ -7,13 +7,12 @@
 """
 from __future__ import absolute_import
 
-from nose.plugins.attrib import attr
-from nose.tools import raises
 
 import _plotly_utils.exceptions
 from plotly import optional_imports
 from chart_studio.plotly import plotly as py
 from unittest import TestCase
+import pytest
 
 matplotlylib = optional_imports.get_module("plotly.matplotlylib")
 
@@ -21,26 +20,24 @@
     import matplotlib.pyplot as plt
 
 
-@attr("matplotlib")
 class PlotMPLTest(TestCase):
     def setUp(self):
         py.sign_in("PlotlyImageTest", "786r5mecv0", plotly_domain="https://plot.ly")
 
-    @raises(_plotly_utils.exceptions.PlotlyGraphObjectError)
     def test_update_type_error(self):
         fig, ax = plt.subplots()
         ax.plot([1, 2, 3])
         update = []
-        py.plot_mpl(fig, update=update, filename="nosetests", auto_open=False)
+        with pytest.raises(_plotly_utils.exceptions.PlotlyGraphObjectError):
+            py.plot_mpl(fig, update=update, filename="nosetests", auto_open=False)
 
-    @raises(KeyError)
     def test_update_validation_error(self):
         fig, ax = plt.subplots()
         ax.plot([1, 2, 3])
         update = {"invalid": "anything"}
-        py.plot_mpl(fig, update=update, filename="nosetests", auto_open=False)
+        with pytest.raises(KeyError):
+            py.plot_mpl(fig, update=update, filename="nosetests", auto_open=False)
 
-    @attr("slow")
     def test_update(self):
         fig, ax = plt.subplots()
         ax.plot([1, 2, 3])
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_file/test_file.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_file/test_file.py
index 3b3746414aa..4dccef14467 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_file/test_file.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_file/test_file.py
@@ -8,14 +8,12 @@
 import random
 import string
 
-from nose.plugins.attrib import attr
 
 from chart_studio import plotly as py
 from chart_studio.exceptions import PlotlyRequestError
 from chart_studio.tests.utils import PlotlyTestCase
 
 
-@attr("slow")
 class FolderAPITestCase(PlotlyTestCase):
     def setUp(self):
         super(FolderAPITestCase, self).setUp()
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_figure/test_get_figure.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_figure/test_get_figure.py
index 69b6da830c6..b0c4ca68ba2 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_figure/test_get_figure.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_figure/test_get_figure.py
@@ -10,7 +10,6 @@
 from unittest import skipIf
 
 import six
-from nose.plugins.attrib import attr
 
 import _plotly_utils.exceptions
 from chart_studio import exceptions
@@ -38,7 +37,6 @@ def is_trivial(obj):
 
 
 class GetFigureTest(PlotlyTestCase):
-    @attr("slow")
     def test_get_figure(self):
         un = "PlotlyImageTest"
         ak = "786r5mecv0"
@@ -46,7 +44,6 @@ def test_get_figure(self):
         py.sign_in(un, ak)
         py.get_figure("PlotlyImageTest", str(file_id))
 
-    @attr("slow")
     def test_get_figure_with_url(self):
         un = "PlotlyImageTest"
         ak = "786r5mecv0"
@@ -62,7 +59,6 @@ def test_get_figure_invalid_1(self):
         with self.assertRaises(exceptions.PlotlyError):
             py.get_figure(url)
 
-    @attr("slow")
     def test_get_figure_invalid_2(self):
         un = "PlotlyImageTest"
         ak = "786r5mecv0"
@@ -80,7 +76,6 @@ def test_get_figure_invalid_3(self):
         with self.assertRaises(ValueError):
             py.get_figure(url)
 
-    @attr("slow")
     def test_get_figure_does_not_exist(self):
         un = "PlotlyImageTest"
         ak = "786r5mecv0"
@@ -89,7 +84,6 @@ def test_get_figure_does_not_exist(self):
         with self.assertRaises(_plotly_utils.exceptions.PlotlyError):
             py.get_figure(url)
 
-    @attr("slow")
     def test_get_figure_raw(self):
         un = "PlotlyImageTest"
         ak = "786r5mecv0"
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_requests/test_get_requests.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_requests/test_get_requests.py
index a57487f3107..1f7c96369f3 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_requests/test_get_requests.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_get_requests/test_get_requests.py
@@ -9,7 +9,6 @@
 
 import requests
 import six
-from nose.plugins.attrib import attr
 import json as _json
 
 from chart_studio.tests.utils import PlotlyTestCase
@@ -25,7 +24,6 @@
 
 
 class GetRequestsTest(PlotlyTestCase):
-    @attr("slow")
     def test_user_does_not_exist(self):
         username = "user_does_not_exist"
         api_key = "invalid-apikey"
@@ -47,7 +45,6 @@ def test_user_does_not_exist(self):
         self.assertEqual(response.status_code, 404)
         self.assertEqual(content["error"], error_message)
 
-    @attr("slow")
     def test_file_does_not_exist(self):
         username = "PlotlyImageTest"
         api_key = "786r5mecv0"
@@ -68,7 +65,6 @@ def test_file_does_not_exist(self):
         self.assertEqual(response.status_code, 404)
         self.assertEqual(content["error"], error_message)
 
-    @attr("slow")
     def test_wrong_api_key(self):  # TODO: does this test the right thing?
         username = "PlotlyImageTest"
         api_key = "invalid-apikey"
@@ -85,7 +81,6 @@ def test_wrong_api_key(self):  # TODO: does this test the right thing?
     # Locked File
     # TODO
 
-    @attr("slow")
     def test_private_permission_defined(self):
         username = "PlotlyImageTest"
         api_key = "786r5mecv0"
@@ -105,7 +100,6 @@ def test_private_permission_defined(self):
     # Private File that is shared
     # TODO
 
-    @attr("slow")
     def test_missing_headers(self):
         file_owner = "get_test_user"
         file_id = 0
@@ -121,7 +115,6 @@ def test_missing_headers(self):
                 content = _json.loads(response.content.decode("unicode_escape"))
             self.assertEqual(response.status_code, 422)
 
-    @attr("slow")
     def test_valid_request(self):
         username = "PlotlyImageTest"
         api_key = "786r5mecv0"
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_grid/test_grid.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_grid/test_grid.py
index 669dd46f551..ac542e70fb7 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_grid/test_grid.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_grid/test_grid.py
@@ -11,7 +11,6 @@
 import string
 from unittest import skip
 
-from nose.plugins.attrib import attr
 
 from chart_studio import plotly as py
 from chart_studio.exceptions import InputError, PlotlyRequestError
@@ -54,11 +53,9 @@ def upload_and_return_grid(self):
         return g
 
     # Nominal usage
-    @attr("slow")
     def test_grid_upload(self):
         self.upload_and_return_grid()
 
-    @attr("slow")
     def test_grid_upload_in_new_folder(self):
         g = self.get_grid()
         path = "new folder: {0}/grid in folder {1}".format(
@@ -66,7 +63,6 @@ def test_grid_upload_in_new_folder(self):
         )
         py.grid_ops.upload(g, path, auto_open=False)
 
-    @attr("slow")
     def test_grid_upload_in_existing_folder(self):
         g = self.get_grid()
         folder = random_filename()
@@ -75,19 +71,16 @@ def test_grid_upload_in_existing_folder(self):
         path = "existing folder: {0}/grid in folder {1}".format(folder, filename)
         py.grid_ops.upload(g, path, auto_open=False)
 
-    @attr("slow")
     def test_column_append(self):
         g = self.upload_and_return_grid()
         new_col = Column([1, 5, 3], "new col")
         py.grid_ops.append_columns([new_col], grid=g)
 
-    @attr("slow")
     def test_row_append(self):
         g = self.upload_and_return_grid()
         new_rows = [[1, 2], [10, 20]]
         py.grid_ops.append_rows(new_rows, grid=g)
 
-    @attr("slow")
     def test_plot_from_grid(self):
         g = self.upload_and_return_grid()
         url = py.plot(
@@ -97,7 +90,6 @@ def test_plot_from_grid(self):
         )
         return url, g
 
-    @attr("slow")
     def test_get_figure_from_references(self):
         url, g = self.test_plot_from_grid()
         fig = py.get_figure(url)
@@ -143,7 +135,6 @@ def test_row_append_of_non_uploaded_grid(self):
             py.grid_ops.append_rows(rows, grid=g)
 
     # Input Errors
-    @attr("slow")
     def test_unequal_length_rows(self):
         g = self.upload_and_return_grid()
         rows = [[1, 2], ["to", "many", "cells"]]
@@ -158,7 +149,6 @@ def test_duplicate_columns(self):
             Grid([c1, c2])
 
     # Test delete
-    @attr("slow")
     def test_delete_grid(self):
         g = self.get_grid()
         fn = random_filename()
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
index d9c5253c820..c4d43a636cd 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
@@ -6,14 +6,12 @@
 import itertools
 import warnings
 
-from nose.plugins.attrib import attr
 
 import _plotly_utils.exceptions
 from chart_studio.plotly import plotly as py
 from chart_studio.tests.utils import PlotlyTestCase
 
 
-@attr("slow")
 class TestImage(PlotlyTestCase):
     def setUp(self):
         super(TestImage, self).setUp()
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_meta/test_meta.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_meta/test_meta.py
index d26fb8c6010..2af3ff9df3c 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_meta/test_meta.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_meta/test_meta.py
@@ -10,7 +10,6 @@
 import random
 import string
 
-from nose.plugins.attrib import attr
 from unittest import skip
 
 from chart_studio import plotly as py
@@ -33,7 +32,6 @@ def random_filename(self):
         unique_filename = "Valid Grid with Meta " + "".join(random_chars)
         return unique_filename
 
-    @attr("slow")
     def test_upload_meta(self):
         unique_filename = self.random_filename()
         grid_url = py.grid_ops.upload(self._grid, unique_filename, auto_open=False)
@@ -41,7 +39,6 @@ def test_upload_meta(self):
         # Add some Metadata to that grid
         py.meta_ops.upload(self._meta, grid_url=grid_url)
 
-    @attr("slow")
     def test_upload_meta_with_grid(self):
         c1 = Column([1, 2, 3, 4], "first column")
         Grid([c1])
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_plotly/test_plot.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_plotly/test_plot.py
index 3982bde7d88..7351f1ee2a9 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_plotly/test_plot.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_plotly/test_plot.py
@@ -13,7 +13,6 @@
 import json as _json
 import warnings
 
-from nose.plugins.attrib import attr
 
 import chart_studio.tools as tls
 import plotly.tools
@@ -37,7 +36,6 @@ def setUp(self):
         py.sign_in("PlotlyImageTest", "786r5mecv0")
         self.simple_figure = {"data": [{"x": [1, 2, 3], "y": [2, 1, 2]}]}
 
-    @attr("slow")
     def test_plot_valid(self):
         fig = {
             "data": [{"x": (1, 2, 3), "y": (2, 1, 2)}],
@@ -155,7 +153,6 @@ def test_plot_option_logic_only_sharing_given(self):
         }
         self.assertEqual(plot_option_logic, expected_plot_option_logic)
 
-    @attr("slow")
     def test_plot_url_given_sharing_key(self):
 
         # Give share_key is requested, the retun url should contain
@@ -175,7 +172,6 @@ def test_plot_url_given_sharing_key(self):
 
         self.assertTrue("share_key=" in plot_url)
 
-    @attr("slow")
     def test_plot_url_response_given_sharing_key(self):
 
         # Given share_key is requested, get request of the url should
@@ -196,7 +192,6 @@ def test_plot_url_response_given_sharing_key(self):
 
         self.assertEqual(response.status_code, 200)
 
-    @attr("slow")
     def test_private_plot_response_with_and_without_share_key(self):
 
         # The json file of the private plot should be 404 and once
diff --git a/packages/python/plotly/plotly/matplotlylib/mplexporter/tests/test_basic.py b/packages/python/plotly/plotly/matplotlylib/mplexporter/tests/test_basic.py
index 1c4dfb3e92b..b86759fa183 100644
--- a/packages/python/plotly/plotly/matplotlylib/mplexporter/tests/test_basic.py
+++ b/packages/python/plotly/plotly/matplotlylib/mplexporter/tests/test_basic.py
@@ -1,7 +1,7 @@
 import matplotlib
 import numpy as np
 from distutils.version import LooseVersion
-from nose.plugins.skip import SkipTest
+import pytest
 from numpy.testing import assert_warns
 
 from ..exporter import Exporter
@@ -168,7 +168,7 @@ def test_image():
     # Test fails for matplotlib 1.5+ because the size of the image
     # generated by matplotlib has changed.
     if LooseVersion(matplotlib.__version__) >= LooseVersion('1.5.0'):
-        raise SkipTest("Test fails for matplotlib version > 1.5.0");
+        pytest.skip("Test fails for matplotlib version > 1.5.0")
     np.random.seed(0)  # image size depends on the seed
     fig, ax = plt.subplots(figsize=(2, 2))
     ax.imshow(np.random.random((10, 10)),
diff --git a/packages/python/plotly/plotly/tests/test_core/test_colors/test_colors.py b/packages/python/plotly/plotly/tests/test_core/test_colors/test_colors.py
index 053b595e507..e382e9bfd7d 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_colors/test_colors.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_colors/test_colors.py
@@ -1,6 +1,5 @@
 from unittest import TestCase
 
-from nose.tools import raises
 import plotly.tools as tls
 from plotly.exceptions import PlotlyError
 import plotly.colors as colors
diff --git a/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_move_delete_traces.py b/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_move_delete_traces.py
index a644cf65940..9a8e332549b 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_move_delete_traces.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_move_delete_traces.py
@@ -1,6 +1,6 @@
 import sys
 from unittest import TestCase
-from nose.tools import raises
+import pytest
 
 import plotly.graph_objs as go
 
@@ -80,12 +80,12 @@ def test_move_and_delete_traces(self):
         self.figure._send_deleteTraces_msg.assert_called_once_with([1])
         self.figure._send_moveTraces_msg.assert_called_once_with([0, 1], [1, 0])
 
-    @raises(ValueError)
     def test_validate_assigned_traces_are_subset(self):
         traces = self.figure.data
-        self.figure.data = [traces[2], go.Scatter(y=[3, 2, 1]), traces[1]]
+        with pytest.raises(ValueError):
+            self.figure.data = [traces[2], go.Scatter(y=[3, 2, 1]), traces[1]]
 
-    @raises(ValueError)
     def test_validate_assigned_traces_are_not_duplicates(self):
         traces = self.figure.data
-        self.figure.data = [traces[2], traces[1], traces[1]]
+        with pytest.raises(ValueError):
+            self.figure.data = [traces[2], traces[1], traces[1]]
diff --git a/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_on_change.py b/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_on_change.py
index 5f2aeb610ff..8e2ce3426df 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_on_change.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_figure_messages/test_on_change.py
@@ -1,6 +1,6 @@
 import sys
 from unittest import TestCase
-from nose.tools import raises
+import pytest
 
 import plotly.graph_objs as go
 
@@ -24,26 +24,26 @@ def setUp(self):
 
     # on_change validation
     # --------------------
-    @raises(ValueError)
     def test_raise_if_no_figure(self):
         scatt = go.Scatter()
         fn = MagicMock()
-        scatt.on_change(fn, "x")
+        with pytest.raises(ValueError):
+            scatt.on_change(fn, "x")
 
-    @raises(ValueError)
     def test_raise_on_frame_hierarchy(self):
         fn = MagicMock()
-        self.figure.frames[0].layout.xaxis.on_change(fn, "range")
+        with pytest.raises(ValueError):
+            self.figure.frames[0].layout.xaxis.on_change(fn, "range")
 
-    @raises(ValueError)
     def test_validate_property_path_nested(self):
         fn = MagicMock()
-        self.figure.layout.xaxis.on_change(fn, "bogus")
+        with pytest.raises(ValueError):
+            self.figure.layout.xaxis.on_change(fn, "bogus")
 
-    @raises(ValueError)
     def test_validate_property_path_nested(self):
         fn = MagicMock()
-        self.figure.layout.on_change(fn, "xaxis.titlefont.bogus")
+        with pytest.raises(ValueError):
+            self.figure.layout.on_change(fn, "xaxis.titlefont.bogus")
 
     # Python triggered changes
     # ------------------------
diff --git a/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py b/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py
index d7331872e86..7a9efdcc7a7 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py
@@ -1,29 +1,28 @@
 from unittest import TestCase
 import plotly.graph_objs as go
-from nose.tools import raises
-
+import pytest
 
 class TestNoFrames(TestCase):
     if "FigureWidget" in go.__dict__.keys():
 
-        @raises(ValueError)
         def test_no_frames_in_constructor_kwarg(self):
-            go.FigureWidget(frames=[{}])
+            with pytest.raises(ValueError):
+                go.FigureWidget(frames=[{}])
 
         def test_emtpy_frames_ok_as_constructor_kwarg(self):
             go.FigureWidget(frames=[])
 
-        @raises(ValueError)
         def test_no_frames_in_constructor_dict(self):
-            go.FigureWidget({"frames": [{}]})
+            with pytest.raises(ValueError):
+                go.FigureWidget({"frames": [{}]})
 
         def test_emtpy_frames_ok_as_constructor_dict_key(self):
             go.FigureWidget({"frames": []})
 
-        @raises(ValueError)
         def test_no_frames_assignment(self):
             fig = go.FigureWidget()
-            fig.frames = [{}]
+            with pytest.raises(ValueError):
+                fig.frames = [{}]
 
         def test_emtpy_frames_assignment_ok(self):
             fig = go.FigureWidget()
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_annotations.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_annotations.py
index c551bc5be13..65aff11e98a 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_annotations.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_annotations.py
@@ -8,8 +8,6 @@
 from __future__ import absolute_import
 from unittest import skip
 
-from nose.tools import raises
-
 from plotly.exceptions import (
     PlotlyError,
     PlotlyDictKeyError,
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_append_trace.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_append_trace.py
index 9f522492226..f01770ceb81 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_append_trace.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_append_trace.py
@@ -1,6 +1,5 @@
 from __future__ import absolute_import
-
-from nose.tools import raises
+import pytest
 
 from plotly.graph_objs import (
     Data,
@@ -19,31 +18,31 @@
 import copy
 
 
-@raises(Exception)
 def test_print_grid_before_make_subplots():
     fig = Figure()
-    fig.print_grid()
+    with pytest.raises(Exception):
+        fig.print_grid()
 
 
-@raises(Exception)
 def test_append_trace_before_make_subplots():
     trace = Scatter(x=[1, 2, 3], y=[2, 3, 4])
     fig = Figure()
-    fig.append_trace(trace, 2, 2)
+    with pytest.raises(Exception):
+        fig.append_trace(trace, 2, 2)
 
 
-@raises(Exception)
 def test_append_trace_row_out_of_range():
     trace = Scatter(x=[1, 2, 3], y=[2, 3, 4])
     fig = tls.make_subplots(rows=2, cols=3)
-    fig.append_trace(trace, 10, 2)
+    with pytest.raises(Exception):
+        fig.append_trace(trace, 10, 2)
 
 
-@raises(Exception)
 def test_append_trace_col_out_of_range():
     trace = Scatter(x=[1, 2, 3], y=[2, 3, 4])
     fig = tls.make_subplots(rows=2, cols=3)
-    fig.append_trace(trace, 2, 0)
+    with pytest.raises(Exception):
+        fig.append_trace(trace, 2, 0)
 
 
 def test_append_scatter():
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_constructor.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_constructor.py
index 870b11b3de2..09fa78857b8 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_constructor.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_constructor.py
@@ -1,6 +1,6 @@
 from unittest import TestCase
 import plotly.graph_objs as go
-from nose.tools import raises
+import pytest
 
 
 class TestGraphObjConstructor(TestCase):
@@ -28,18 +28,18 @@ def test_kwarg_takes_precedence(self):
             m.to_plotly_json(), {"color": "blue", "size": 12, "opacity": 0.6}
         )
 
-    @raises(ValueError)
     def test_invalid_kwarg(self):
-        go.scatter.Marker(bogus=[1, 2, 3])
+        with pytest.raises(ValueError):
+            go.scatter.Marker(bogus=[1, 2, 3])
 
-    @raises(ValueError)
     def test_invalid_arg(self):
-        go.scatter.Marker([1, 2, 3])
+        with pytest.raises(ValueError):
+            go.scatter.Marker([1, 2, 3])
 
-    @raises(ValueError)
     def test_valid_arg_with_invalid_key_name(self):
-        go.scatter.Marker({"bogus": 12})
+        with pytest.raises(ValueError):
+            go.scatter.Marker({"bogus": 12})
 
-    @raises(ValueError)
     def test_valid_arg_with_invalid_key_value(self):
-        go.scatter.Marker({"color": "bogus"})
+        with pytest.raises(ValueError):
+            go.scatter.Marker({"color": "bogus"})
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_data.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_data.py
index faec80efcd0..136a043a46f 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_data.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_data.py
@@ -8,7 +8,6 @@
 from __future__ import absolute_import
 from unittest import skip
 
-from nose.tools import raises
 
 from plotly.exceptions import (
     PlotlyError,
@@ -30,7 +29,6 @@ def test_trivial():
     assert Data() == list()
 
 
-# @raises(PlotlyError)
 def test_weird_instantiation():  # Python allows this...
     assert Data({}) == []
 
@@ -43,26 +41,21 @@ def test_dict_instantiation():
     Data([{"type": "scatter"}])
 
 
-# @raises(PlotlyDictKeyError)
 def test_dict_instantiation_key_error():
     assert Data([{"not-a-key": "anything"}]) == [{"not-a-key": "anything"}]
 
 
-# @raises(PlotlyDictValueError)
 def test_dict_instantiation_key_error_2():
     assert Data([{"marker": "not-a-dict"}]) == [{"marker": "not-a-dict"}]
 
 
-# @raises(PlotlyDataTypeError)
 def test_dict_instantiation_type_error():
     assert Data([{"type": "invalid_type"}]) == [{"type": "invalid_type"}]
 
 
-# @raises(PlotlyListEntryError)
 def test_dict_instantiation_graph_obj_error_0():
     assert Data([Data()]) == [[]]
 
 
-# raises(PlotlyListEntryError)
 def test_dict_instantiation_graph_obj_error_2():
     assert Data([Annotations()]) == [[]]
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_error_bars.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_error_bars.py
index 7526135d154..d12abbc24c6 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_error_bars.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_error_bars.py
@@ -7,7 +7,6 @@
 """
 from __future__ import absolute_import
 
-from nose.tools import raises
 from plotly.graph_objs import ErrorX, ErrorY
 from plotly.exceptions import PlotlyDictKeyError
 
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_figure_properties.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_figure_properties.py
index 26a256de9f1..99ee26e0bad 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_figure_properties.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_figure_properties.py
@@ -1,6 +1,7 @@
 from unittest import TestCase
+import pytest
+
 import plotly.graph_objs as go
-from nose.tools import raises
 import plotly.io as pio
 
 
@@ -81,21 +82,21 @@ def test_property_assignment_dots(self):
         self.figure["frames[0].layout.yaxis.title.text"] = "f2"
         self.assertEqual(self.figure["frames.0.layout.yaxis.title.text"], "f2")
 
-    @raises(AttributeError)
     def test_access_invalid_attr(self):
-        self.figure.bogus
+        with pytest.raises(AttributeError):
+            self.figure.bogus
 
-    @raises(KeyError)
     def test_access_invalid_item(self):
-        self.figure["bogus"]
+        with pytest.raises(KeyError):
+            self.figure["bogus"]
 
-    @raises(AttributeError)
     def test_assign_invalid_attr(self):
-        self.figure.bogus = "val"
+        with pytest.raises(AttributeError):
+            self.figure.bogus = "val"
 
-    @raises(KeyError)
     def test_access_invalid_item(self):
-        self.figure["bogus"] = "val"
+        with pytest.raises(KeyError):
+            self.figure["bogus"] = "val"
 
     # Update
     def test_update_layout(self):
@@ -202,9 +203,9 @@ def test_update_frames(self):
         )
         self.assertEqual(self.figure.frames[0].layout.yaxis.title.text, "f4")
 
-    @raises(ValueError)
     def test_update_invalid_attr(self):
-        self.figure.layout.update({"xaxis": {"bogus": 32}})
+        with pytest.raises(ValueError):
+            self.figure.layout.update({"xaxis": {"bogus": 32}})
 
     # plotly_restyle
     def test_plotly_restyle(self):
@@ -218,13 +219,13 @@ def test_plotly_restyle(self):
 
         self.assertEqual(self.figure.data[0].marker.color, "blue")
 
-    @raises(ValueError)
     def test_restyle_validate_property(self):
-        self.figure.plotly_restyle({"bogus": 3}, trace_indexes=[0])
+        with pytest.raises(ValueError):
+            self.figure.plotly_restyle({"bogus": 3}, trace_indexes=[0])
 
-    @raises(ValueError)
     def test_restyle_validate_property_nested(self):
-        self.figure.plotly_restyle({"marker.bogus": 3}, trace_indexes=[0])
+        with pytest.raises(ValueError):
+            self.figure.plotly_restyle({"marker.bogus": 3}, trace_indexes=[0])
 
     # plotly_relayout
     def test_plotly_relayout(self):
@@ -235,17 +236,17 @@ def test_plotly_relayout(self):
         self.figure.plotly_relayout(relayout_data={"xaxis.range": [10, 20]})
         self.assertEqual(self.figure.layout.xaxis.range, (10, 20))
 
-    @raises(ValueError)
     def test_relayout_validate_property(self):
-        self.figure.plotly_relayout({"bogus": [1, 3]})
+        with pytest.raises(ValueError):
+            self.figure.plotly_relayout({"bogus": [1, 3]})
 
-    @raises(ValueError)
     def test_relayout_validate_property_nested(self):
-        self.figure.plotly_relayout({"xaxis.bogus": [1, 3]})
+        with pytest.raises(ValueError):
+            self.figure.plotly_relayout({"xaxis.bogus": [1, 3]})
 
-    @raises(ValueError)
     def test_relayout_validate_unintialized_subplot(self):
-        self.figure.plotly_relayout({"xaxis2.range": [1, 3]})
+        with pytest.raises(ValueError):
+            self.figure.plotly_relayout({"xaxis2.range": [1, 3]})
 
     # plotly_update
     def test_plotly_update_layout(self):
@@ -267,10 +268,10 @@ def test_plotly_update_data(self):
 
         self.assertEqual(self.figure.data[0].marker.color, "blue")
 
-    @raises(ValueError)
     def test_plotly_update_validate_property_trace(self):
-        self.figure.plotly_update(restyle_data={"bogus": 3}, trace_indexes=[0])
+        with pytest.raises(ValueError):
+            self.figure.plotly_update(restyle_data={"bogus": 3}, trace_indexes=[0])
 
-    @raises(ValueError)
     def test_plotly_update_validate_property_layout(self):
-        self.figure.plotly_update(relayout_data={"xaxis.bogus": [1, 3]})
+        with pytest.raises(ValueError):
+            self.figure.plotly_update(relayout_data={"xaxis.bogus": [1, 3]})
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_frames.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_frames.py
index 37a33b20265..c7dc96d8e82 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_frames.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_frames.py
@@ -4,7 +4,7 @@
 
 from plotly.graph_objs import Bar, Frames, Frame, Layout
 
-from nose.plugins.attrib import attr
+import pytest
 
 import re
 
@@ -43,7 +43,7 @@ def test_non_string_frame(self):
         # with self.assertRaises(exceptions.PlotlyListEntryError):
         #     frames.append(0)
 
-    @attr("nodev")
+    @pytest.mark.nodev
     def test_deeply_nested_layout_attributes(self):
         frames = Frame
         frames.layout = [Layout()]
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_layout_subplots.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_layout_subplots.py
index 1401512ada4..037d2384983 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_layout_subplots.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_layout_subplots.py
@@ -1,6 +1,7 @@
 from unittest import TestCase
+import pytest
+
 import plotly.graph_objs as go
-from nose.tools import raises
 import plotly.io as pio
 
 
@@ -33,13 +34,13 @@ def test_initial_access_subplots(self):
         self.assertIs(self.layout.mapbox, self.layout.mapbox1)
         self.assertIs(self.layout.polar, self.layout.polar1)
 
-    @raises(AttributeError)
     def test_initial_access_subplot2(self):
-        self.layout.xaxis2
+        with pytest.raises(AttributeError):
+            self.layout.xaxis2
 
-    @raises(KeyError)
     def test_initial_access_subplot2(self):
-        self.layout["xaxis2"]
+        with pytest.raises(KeyError):
+            self.layout["xaxis2"]
 
     def test_assign_subplots(self):
         self.assertIsNone(self.layout.xaxis.title.text)
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_properties_validated.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_properties_validated.py
index e31d1dad095..c3edcfb1113 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_properties_validated.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_properties_validated.py
@@ -1,6 +1,6 @@
 from unittest import TestCase
 import plotly.graph_objs as go
-from nose.tools import raises
+import pytest
 
 
 class TestPropertyValidation(TestCase):
@@ -9,43 +9,43 @@ def setUp(self):
         self.scatter = go.Scatter()
         self.scatter.name = "Scatter 1"
 
-    @raises(ValueError)
     def test_validators_work_attr(self):
         """
         Note: all of the individual validators are tested in
         `_plotly_utils/tests/validators`. Here we're just making sure that
         datatypes make use of validators
         """
-        self.scatter.name = [1, 2, 3]
+        with pytest.raises(ValueError):
+            self.scatter.name = [1, 2, 3]
 
-    @raises(ValueError)
     def test_validators_work_item(self):
         """
         Note: all of the individual validators are tested in
         `_plotly_utils/tests/validators`. Here we're just making sure that
         datatypes make use of validators
         """
-        self.scatter["name"] = [1, 2, 3]
+        with pytest.raises(ValueError):
+            self.scatter["name"] = [1, 2, 3]
 
-    @raises(ValueError)
     def test_invalid_attr_assignment(self):
-        self.scatter.bogus = 87
+        with pytest.raises(ValueError):
+            self.scatter.bogus = 87
 
-    @raises(ValueError)
     def test_invalid_item_assignment(self):
-        self.scatter["bogus"] = 87
+        with pytest.raises(ValueError):
+            self.scatter["bogus"] = 87
 
-    @raises(ValueError)
     def test_invalid_dot_assignment(self):
-        self.scatter["marker.bogus"] = 87
+        with pytest.raises(ValueError):
+            self.scatter["marker.bogus"] = 87
 
-    @raises(ValueError)
     def test_invalid_tuple_assignment(self):
-        self.scatter[("marker", "bogus")] = 87
+        with pytest.raises(ValueError):
+            self.scatter[("marker", "bogus")] = 87
 
-    @raises(ValueError)
     def test_invalid_constructor_kwarg(self):
-        go.Scatter(bogus=87)
+        with pytest.raises(ValueError):
+            go.Scatter(bogus=87)
 
 
 class TestPropertyPresentation(TestCase):
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_scatter.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_scatter.py
index d3af52db2a4..78d3aa1d773 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_scatter.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_scatter.py
@@ -7,7 +7,6 @@
 """
 from __future__ import absolute_import
 
-from nose.tools import raises
 from plotly.graph_objs import Scatter
 from plotly.exceptions import PlotlyError
 
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py
index 47bbf12b064..06f50fe8fd4 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py
@@ -2,7 +2,7 @@
 
 import copy
 from unittest import TestCase
-from nose.tools import raises
+import pytest
 
 import plotly.io as pio
 import plotly.graph_objs as go
@@ -105,27 +105,27 @@ def test_defaults_in_property_assignment(self):
             },
         )
 
-    @raises(ValueError)
     def test_invalid_defaults_property_name_constructor(self):
-        go.Figure(layout={"template": {"layout": {"imagedefaults": {"bogus": 500}}}})
+        with pytest.raises(ValueError):
+            go.Figure(layout={"template": {"layout": {"imagedefaults": {"bogus": 500}}}})
 
-    @raises(ValueError)
     def test_invalid_defaults_property_value_constructor(self):
-        go.Figure(
-            layout={
+        with pytest.raises(ValueError):
+            go.Figure(
+                layout={
                 "template": {"layout": {"imagedefaults": {"sizex": "str not number"}}}
-            }
-        )
+                }
+            )
 
-    @raises(ValueError)
     def test_invalid_defaults_property_name_constructor(self):
-        go.Figure(layout={"template": {"layout": {"xaxis": {"bogus": 500}}}})
+        with pytest.raises(ValueError):
+            go.Figure(layout={"template": {"layout": {"xaxis": {"bogus": 500}}}})
 
-    @raises(ValueError)
     def test_invalid_defaults_property_value_constructor(self):
-        go.Figure(
-            layout={"template": {"layout": {"xaxis": {"range": "str not tuple"}}}}
-        )
+        with pytest.raises(ValueError):
+            go.Figure(
+                layout={"template": {"layout": {"xaxis": {"range": "str not tuple"}}}}
+            )
 
     # plotly.io.template tests
     # ------------------------
diff --git a/packages/python/plotly/plotly/tests/test_core/test_offline/test_offline.py b/packages/python/plotly/plotly/tests/test_core/test_offline/test_offline.py
index b922d4f5ec7..315a81b9417 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_offline/test_offline.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_offline/test_offline.py
@@ -6,8 +6,8 @@
 
 import os
 from unittest import TestCase
+import pytest
 
-from nose.plugins.attrib import attr
 import json as _json
 
 import plotly
@@ -314,7 +314,7 @@ def get_html():
 
         self.assertIn('"bogus": 42', html)
 
-    @attr("nodev")
+    @pytest.mark.nodev
     def test_plotlyjs_version(self):
         path = os.path.join(packages_root, "javascript", "plotlywidget", "package.json")
         with open(path, "rt") as f:
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_annotations.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_annotations.py
index 6d0b337cd73..18d8fb7c4b1 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_annotations.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_annotations.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 
@@ -14,7 +14,7 @@
     from plotly.tests.test_optional.test_matplotlylib.data.annotations import *
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_annotations():
     fig, ax = plt.subplots()
     ax.plot([1, 2, 3], "b-")
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_axis_scales.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_axis_scales.py
index 9063ce7319a..e7f0753da3a 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_axis_scales.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_axis_scales.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 from plotly.tests.utils import compare_dict, strip_dict_params
@@ -13,7 +13,7 @@
     import matplotlib.pyplot as plt
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_even_linear_scale():
     fig, ax = plt.subplots()
     x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py
index 6a6df896150..2c4454cf22e 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py
@@ -1,6 +1,5 @@
 from __future__ import absolute_import
-
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 from plotly.tests.utils import compare_dict, strip_dict_params
@@ -12,8 +11,7 @@
 if matplotlylib:
     import matplotlib.pyplot as plt
 
-
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_vertical_bar():
     fig, ax = plt.subplots()
     ax.bar(left=D["left"], height=D["height"])
@@ -33,7 +31,7 @@ def test_vertical_bar():
     assert equivalent, msg
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_horizontal_bar():
     fig, ax = plt.subplots()
     ax.barh(bottom=D["bottom"], width=D["width"])
@@ -53,7 +51,7 @@ def test_horizontal_bar():
     assert equivalent, msg
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_h_and_v_bars():
     fig, ax = plt.subplots()
     ax.bar(
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py
index 050432c8987..c9f71d63da1 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 from plotly.tests.test_optional.optional_utils import run_fig
@@ -11,8 +11,7 @@
 if matplotlylib:
     import matplotlib.pyplot as plt
 
-
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_line_data():
     fig, ax = plt.subplots()
     ax.plot(D["x1"], D["y1"])
@@ -31,7 +30,7 @@ def test_line_data():
         )
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_lines_data():
     fig, ax = plt.subplots()
     ax.plot(D["x1"], D["y1"])
@@ -63,7 +62,7 @@ def test_lines_data():
         )
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_bar_data():
     fig, ax = plt.subplots()
     ax.bar(D["x1"], D["y1"])
@@ -74,7 +73,7 @@ def test_bar_data():
         )
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_bars_data():
     fig, ax = plt.subplots()
     ax.bar(D["x1"], D["y1"], color="r")
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_date_times.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_date_times.py
index ac4ee079e3d..68546749eb4 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_date_times.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_date_times.py
@@ -3,9 +3,9 @@
 import datetime
 import random
 from unittest import TestCase
+import pytest
 
 import pandas as pd
-from nose.plugins.attrib import attr
 
 import plotly.tools as tls
 from plotly import optional_imports
@@ -17,7 +17,7 @@
     import matplotlib.pyplot as plt
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 class TestDateTimes(TestCase):
     def test_normal_mpl_dates(self):
         datetime_format = "%Y-%m-%d %H:%M:%S"
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_lines.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_lines.py
index 642936aed13..bb69c18ecc3 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_lines.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_lines.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 from plotly.tests.utils import compare_dict, strip_dict_params
@@ -13,7 +13,7 @@
     import matplotlib.pyplot as plt
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_simple_line():
     fig, ax = plt.subplots()
     ax.plot(D["x1"], D["y1"], label="simple")
@@ -29,7 +29,7 @@ def test_simple_line():
     assert equivalent, msg
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_complicated_line():
     fig, ax = plt.subplots()
     ax.plot(D["x1"], D["y1"], "ro", markersize=10, alpha=0.5, label="one")
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_scatter.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_scatter.py
index 839880dc594..96984130d87 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_scatter.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_scatter.py
@@ -1,6 +1,5 @@
 from __future__ import absolute_import
-
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 from plotly.tests.utils import compare_dict, strip_dict_params
@@ -13,7 +12,7 @@
     import matplotlib.pyplot as plt
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_simple_scatter():
     fig, ax = plt.subplots()
     ax.scatter(D["x1"], D["y1"])
@@ -33,7 +32,7 @@ def test_simple_scatter():
     assert equivalent, msg
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_double_scatter():
     fig, ax = plt.subplots()
     ax.scatter(D["x1"], D["y1"], color="red", s=121, marker="^", alpha=0.5)
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_subplots.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_subplots.py
index 4553eadeb43..6d4e0959dd2 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_subplots.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_subplots.py
@@ -1,6 +1,6 @@
 from __future__ import absolute_import
 
-from nose.plugins.attrib import attr
+import pytest
 
 from plotly import optional_imports
 from plotly.tests.utils import compare_dict, strip_dict_params
@@ -14,7 +14,7 @@
     import matplotlib.pyplot as plt
 
 
-@attr("matplotlib")
+@pytest.mark.matplotlib
 def test_blank_subplots():
     fig = plt.figure()
     gs = GridSpec(4, 6)
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_offline/test_offline.py b/packages/python/plotly/plotly/tests/test_optional/test_offline/test_offline.py
index f16575d7c2e..d36934d1eae 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_offline/test_offline.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_offline/test_offline.py
@@ -4,11 +4,10 @@
 """
 from __future__ import absolute_import
 import re
-from nose.tools import raises
-from nose.plugins.attrib import attr
 import json as _json
 
 from unittest import TestCase
+import pytest
 
 import plotly
 from plotly import optional_imports
@@ -39,7 +38,7 @@ def test_iplot_works_after_you_call_init_notebook_mode(self):
 
     if matplotlylib:
 
-        @attr("matplotlib")
+        @pytest.mark.matplotlib
         def test_iplot_mpl_works(self):
             # Generate matplotlib plot for tests
             fig = plt.figure()
@@ -64,7 +63,7 @@ def _read_html(self, file_url):
 
     if matplotlylib:
 
-        @attr("matplotlib")
+        @pytest.mark.matplotlib
         def test_default_mpl_plot_generates_expected_html(self):
             # Generate matplotlib plot for tests
             fig = plt.figure()
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_utils/test_utils.py b/packages/python/plotly/plotly/tests/test_optional/test_utils/test_utils.py
index d26e7ac6cea..24d3702491f 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_utils/test_utils.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_utils/test_utils.py
@@ -9,11 +9,11 @@
 import decimal
 from datetime import datetime as dt
 from unittest import TestCase
+import pytest
 
 import numpy as np
 import pandas as pd
 import pytz
-from nose.plugins.attrib import attr
 from pandas.util.testing import assert_series_equal
 import json as _json
 import os
@@ -295,7 +295,7 @@ def test_pil_image_encoding(self):
 
 if matplotlylib:
 
-    @attr("matplotlib")
+    @pytest.mark.matplotlib
     def test_masked_constants_example():
         # example from: https://gist.github.com/tschaume/d123d56bf586276adb98
         data = {
diff --git a/packages/python/plotly/pytest.ini b/packages/python/plotly/pytest.ini
new file mode 100644
index 00000000000..3d05496c99b
--- /dev/null
+++ b/packages/python/plotly/pytest.ini
@@ -0,0 +1,5 @@
+# content of pytest.ini
+[pytest]
+markers =
+    nodev: mark a test as nodev
+    matplotlib: mark a test as matplotlib

From d369fcf80ca72e9cc2d78add97c59eca45fa76e6 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Thu, 20 Feb 2020 19:58:12 -0500
Subject: [PATCH 04/10] make black happy

---
 .../test_figure_widget_backend/test_validate_no_frames.py | 1 +
 .../tests/test_core/test_graph_objs/test_template.py      | 8 ++++++--
 .../tests/test_optional/test_matplotlylib/test_bars.py    | 1 +
 .../tests/test_optional/test_matplotlylib/test_data.py    | 1 +
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py b/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py
index 7a9efdcc7a7..81f07496954 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_figure_widget_backend/test_validate_no_frames.py
@@ -2,6 +2,7 @@
 import plotly.graph_objs as go
 import pytest
 
+
 class TestNoFrames(TestCase):
     if "FigureWidget" in go.__dict__.keys():
 
diff --git a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py
index 06f50fe8fd4..8010e962a92 100644
--- a/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py
+++ b/packages/python/plotly/plotly/tests/test_core/test_graph_objs/test_template.py
@@ -107,13 +107,17 @@ def test_defaults_in_property_assignment(self):
 
     def test_invalid_defaults_property_name_constructor(self):
         with pytest.raises(ValueError):
-            go.Figure(layout={"template": {"layout": {"imagedefaults": {"bogus": 500}}}})
+            go.Figure(
+                layout={"template": {"layout": {"imagedefaults": {"bogus": 500}}}}
+            )
 
     def test_invalid_defaults_property_value_constructor(self):
         with pytest.raises(ValueError):
             go.Figure(
                 layout={
-                "template": {"layout": {"imagedefaults": {"sizex": "str not number"}}}
+                    "template": {
+                        "layout": {"imagedefaults": {"sizex": "str not number"}}
+                    }
                 }
             )
 
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py
index 2c4454cf22e..40d891b941c 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_bars.py
@@ -11,6 +11,7 @@
 if matplotlylib:
     import matplotlib.pyplot as plt
 
+
 @pytest.mark.matplotlib
 def test_vertical_bar():
     fig, ax = plt.subplots()
diff --git a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py
index c9f71d63da1..fc208573b51 100644
--- a/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py
+++ b/packages/python/plotly/plotly/tests/test_optional/test_matplotlylib/test_data.py
@@ -11,6 +11,7 @@
 if matplotlylib:
     import matplotlib.pyplot as plt
 
+
 @pytest.mark.matplotlib
 def test_line_data():
     fig, ax = plt.subplots()

From 0fb9958f7dab06175cbd73f216f7e542d3079870 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Thu, 20 Feb 2020 21:13:32 -0500
Subject: [PATCH 05/10] Update
 packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py

---
 .../tests/test_optional/test_matplotlylib/test_plot_mpl.py      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py b/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
index e1c89017026..4e0dc6fa88c 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
@@ -19,7 +19,7 @@
 if matplotlylib:
     import matplotlib.pyplot as plt
 
-
+@pytest.mark.matplotlib
 class PlotMPLTest(TestCase):
     def setUp(self):
         py.sign_in("PlotlyImageTest", "786r5mecv0", plotly_domain="https://plot.ly")

From f2b60d804e2bc6ad9310a212cb9b18b7fb9fc09f Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Thu, 20 Feb 2020 21:19:06 -0500
Subject: [PATCH 06/10] black

---
 .../tests/test_optional/test_matplotlylib/test_plot_mpl.py       | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py b/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
index 4e0dc6fa88c..a4b2bf52a5a 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_optional/test_matplotlylib/test_plot_mpl.py
@@ -19,6 +19,7 @@
 if matplotlylib:
     import matplotlib.pyplot as plt
 
+
 @pytest.mark.matplotlib
 class PlotMPLTest(TestCase):
     def setUp(self):

From dee2f7fb459da9d2d6c8eb83c36fdfaf2c2b86a9 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Mon, 2 Mar 2020 16:26:47 -0500
Subject: [PATCH 07/10] updated contributing notes and chart-studio tox.ini

---
 contributing.md                               | 24 +++++++++----------
 packages/python/chart-studio/tox.ini          | 13 +++++-----
 .../python/plotly/optional-requirements.txt   |  1 -
 packages/python/plotly/tox.ini                |  7 +++---
 4 files changed, 21 insertions(+), 24 deletions(-)

diff --git a/contributing.md b/contributing.md
index 82ed16b20ba..7565dc641ff 100644
--- a/contributing.md
+++ b/contributing.md
@@ -1,6 +1,6 @@
 # Contributing
 
-The bottom line. Follow your Nose, or our Nose. Write-run-love tests :fist:.
+Thank you for contributing to plotly.py! 
 
 ## Code of Conduct
 
@@ -128,34 +128,34 @@ classes based on the new schema.
 We take advantage of two tools to run tests:
 
 * [`tox`](https://tox.readthedocs.io/en/latest/), which is both a virtualenv management and test tool.
-* [`nose`](https://nose.readthedocs.org/en/latest/), which is is an extension of Python's unittest
+* [`pytest`](https://docs.pytest.org/en/latest/), a powerful framework for unit testing.
 
-### Running Tests with `nose`
+### Running Tests with `pytest`
 
 Since our tests cover *all* the functionality, to prevent tons of errors from showing up and having to parse through a messy output, you'll need to install `optional-requirements.txt` as explained above.
 
-After you've done that, go ahead and follow (y)our Nose!
+After you've done that, go ahead and run the test suite!
 
 ```bash
-nosetests -w  packages/python/plotly/plotly/tests/
+pytest  packages/python/plotly/plotly/tests/
 ```
 
 Or for more *verbose* output:
 
 ```bash
-nosetests -w  packages/python/plotly/plotly/tests/ -v
+pytest -v  packages/python/plotly/plotly/tests/
 ```
 
 Either of those will run *every* test we've written for the Python API. You can get more granular by running something like:
 
 ```bash
-nosetests -w  packages/python/plotly/plotly/tests/test_core/
+pytest  packages/python/plotly/plotly/tests/test_core/
 ```
 
 ... or even more granular by running something like:
 
 ```bash
-nosetests plotly/tests/test_plotly/test_plot.py
+pytest plotly/tests/test_plotly/test_plot.py
 ```
 
 ### Running tests with `tox`
@@ -187,16 +187,16 @@ Where `TOXENV` is the environment list you want to use when invoking `tox` from
 * `tox` will automatically manage a virtual env for each environment you want to test in.
 * You only have to run `tox` and know that the module is working in both `Python 2` and `Python 3`.
 
-Finally, `tox` allows you to pass in additional command line arguments that are formatted in (by us) in the `tox.ini` file, see `{posargs}`. This is setup to help with our `nose attr` configuration. To run only tests that are *not* tagged with `slow`, you could use the following command:
+Finally, `tox` allows you to pass in additional command line arguments that are formatted in (by us) in the `tox.ini` file, see `{posargs}`. This is setup to help with our configuration of [pytest markers](http://doc.pytest.org/en/latest/example/markers.html), which are set up in `packages/python/plotly/pytest.ini`. To run only tests that are *not* tagged with `nodev`, you could use the following command:
 
 ```bash
-tox -- -a '!slow'
+tox -- -a '!nodev'
 ```
 
-Note that anything after `--` is substituted in for `{posargs}` in the tox.ini. For completeness, because it's reasonably confusing, if you want to force a match for *multiple* `nose attr` tags, you comma-separate the tags like so:
+Note that anything after `--` is substituted in for `{posargs}` in the tox.ini. For completeness, because it's reasonably confusing, if you want to force a match for *multiple* `pytest` marker tags, you comma-separate the tags like so:
 
 ```bash
-tox -- -a '!slow','!matplotlib'
+tox -- -a '!nodev','!matplotlib'
 ```
 
 ### Writing Tests
diff --git a/packages/python/chart-studio/tox.ini b/packages/python/chart-studio/tox.ini
index 4a43598e523..faddb36305f 100644
--- a/packages/python/chart-studio/tox.ini
+++ b/packages/python/chart-studio/tox.ini
@@ -24,15 +24,14 @@
 ; PASSING ADDITONAL ARGUMENTS TO TEST COMMANDS
 ; The {posargs} is tox-specific and passes in any command line args after `--`.
 ; For example, given the testing command in *this* file:
-;   nosetests {posargs} -x plotly/tests/test_core
+;   pytest {posargs} -x plotly/tests/test_core
 ;
 ; The following command:
-;   tox -- -a '!slow'
+;   tox -- -k 'not nodev'
 ;
 ; Tells tox to call:
-;   nosetests -a '!slow' -x plotly/tests/test_core
+;   pytest -k 'not nodev' -x plotly/tests/test_core
 ;
-; Which is a nice way to skip slow tests for faster testing cycles.
 
 [tox]
 ; The py{A,B,C}-{X,Y} generates a matrix of envs:
@@ -72,16 +71,16 @@ deps=
 basepython={env:PLOTLY_TOX_PYTHON_27:}
 commands=
     python --version
-    nosetests {posargs} -x chart_studio/tests/
+    pytest {posargs} -x chart_studio/tests/
 
 [testenv:py35-plot_ly]
 basepython={env:PLOTLY_TOX_PYTHON_35:}
 commands=
     python --version
-    nosetests {posargs} -x chart_studio/tests/
+    pytest {posargs} -x chart_studio/tests/
 
 [testenv:py37-plot_ly]
 basepython={env:PLOTLY_TOX_PYTHON_37:}
 commands=
     python --version
-    nosetests {posargs} -x chart_studio/tests/
+    pytest {posargs} -x chart_studio/tests/
diff --git a/packages/python/plotly/optional-requirements.txt b/packages/python/plotly/optional-requirements.txt
index d0bb959e0d9..9886dcd1872 100644
--- a/packages/python/plotly/optional-requirements.txt
+++ b/packages/python/plotly/optional-requirements.txt
@@ -14,7 +14,6 @@ numpy
 ## testing dependencies ##
 coverage==4.3.1
 mock==2.0.0
-nose==1.3.3
 pytest==3.5.1
 backports.tempfile==1.0
 xarray
diff --git a/packages/python/plotly/tox.ini b/packages/python/plotly/tox.ini
index 268c1a2aecd..b1f1cca2f71 100644
--- a/packages/python/plotly/tox.ini
+++ b/packages/python/plotly/tox.ini
@@ -24,15 +24,14 @@
 ; PASSING ADDITONAL ARGUMENTS TO TEST COMMANDS
 ; The {posargs} is tox-specific and passes in any command line args after `--`.
 ; For example, given the testing command in *this* file:
-;   nosetests {posargs} -x plotly/tests/test_core
+;   pytest {posargs} -x plotly/tests/test_core
 ;
 ; The following command:
-;   tox -- -a '!slow'
+;   tox -- -k 'not nodev'
 ;
 ; Tells tox to call:
-;   nosetests -a '!slow' -x plotly/tests/test_core
+;   pytest -k 'not nodev' -x plotly/tests/test_core
 ;
-; Which is a nice way to skip slow tests for faster testing cycles.
 
 [tox]
 ; The py{A,B,C}-{X,Y} generates a matrix of envs:

From 49ffe9463d427203552959cc1b4babf8b3183c7f Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Tue, 3 Mar 2020 14:00:38 -0500
Subject: [PATCH 08/10] using pytest parametrize

---
 contributing.md                               |   6 +
 .../test_plot_ly/test_image/test_image.py     | 114 +++++++-----------
 2 files changed, 51 insertions(+), 69 deletions(-)

diff --git a/contributing.md b/contributing.md
index 7565dc641ff..ceaf5b9f63b 100644
--- a/contributing.md
+++ b/contributing.md
@@ -158,6 +158,12 @@ pytest  packages/python/plotly/plotly/tests/test_core/
 pytest plotly/tests/test_plotly/test_plot.py
 ```
 
+or for a specfic test function
+
+```bash
+pytest plotly/tests/test_plotly/test_plot.py::test_function
+```
+
 ### Running tests with `tox`
 
 Running tests with tox is much more powerful, but requires a bit more setup.
diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
index c4d43a636cd..5403dd6b3a4 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
@@ -5,77 +5,53 @@
 import os
 import itertools
 import warnings
-
+import pytest
 
 import _plotly_utils.exceptions
 from chart_studio.plotly import plotly as py
-from chart_studio.tests.utils import PlotlyTestCase
-
-
-class TestImage(PlotlyTestCase):
-    def setUp(self):
-        super(TestImage, self).setUp()
-        py.sign_in("PlotlyImageTest", "786r5mecv0")
-        self.data = [{"x": [1, 2, 3], "y": [3, 1, 6]}]
-
-
-def _generate_image_get_returns_valid_image_test(image_format, width, height, scale):
-    def test(self):
-        # TODO: better understand why this intermittently fails. See #649
-        num_attempts = 5
-        for i in range(num_attempts):
-            if i > 0:
-                warnings.warn("image test intermittently failed, retrying...")
-            try:
-                image = py.image.get(self.data, image_format, width, height, scale)
-                if image_format in ["png", "jpeg"]:
-                    assert imghdr.what("", image) == image_format
-                return
-            except (KeyError, _plotly_utils.exceptions.PlotlyError):
-                if i == num_attempts - 1:
-                    raise
-
-    return test
-
-
-def _generate_image_save_as_saves_valid_image(image_format, width, height, scale):
-    def _test(self):
-        f, filename = tempfile.mkstemp(".{}".format(image_format))
-        py.image.save_as(
-            self.data,
-            filename,
-            format=image_format,
-            width=width,
-            height=height,
-            scale=scale,
-        )
-        if image_format in ["png", "jpeg"]:
-            assert imghdr.what(filename) == image_format
-        else:
-            assert os.path.getsize(filename) > 0
-
-        os.remove(filename)
-
-    return _test
-
-
-kwargs = {
-    "format": ["png", "jpeg", "pdf", "svg", "emf"],
-    "width": [None, 300],
-    "height": [None, 300],
-    "scale": [None, 5],
-}
 
-for args in itertools.product(
-    kwargs["format"], kwargs["width"], kwargs["height"], kwargs["scale"]
-):
-    for test_generator in [
-        _generate_image_get_returns_valid_image_test,
-        _generate_image_save_as_saves_valid_image,
-    ]:
+py.sign_in("PlotlyImageTest", "786r5mecv0")
+data = [{"x": [1, 2, 3], "y": [3, 1, 6]}]
+
+
+@pytest.mark.parametrize('image_format', ("png", "jpeg", "pdf", "svg", "emf"))
+@pytest.mark.parametrize('width', (None, 300))
+@pytest.mark.parametrize('height', (None, 300))
+@pytest.mark.parametrize('scale', (None, 5))
+def test_image_get_returns_valid_image_test(image_format, width, height, scale):
+    # TODO: better understand why this intermittently fails. See #649
+    num_attempts = 5
+    for i in range(num_attempts):
+        if i > 0:
+            warnings.warn("image test intermittently failed, retrying...")
+        try:
+            image = py.image.get(data, image_format, width, height, scale)
+            if image_format in ["png", "jpeg"]:
+                assert imghdr.what("", image) == image_format
+            return
+        except (KeyError, _plotly_utils.exceptions.PlotlyError):
+            if i == num_attempts - 1:
+                raise
+
+
+@pytest.mark.parametrize('image_format', ("png", "jpeg", "pdf", "svg", "emf"))
+@pytest.mark.parametrize('width', (None, 300))
+@pytest.mark.parametrize('height', (None, 300))
+@pytest.mark.parametrize('scale', (None, 5))
+def test_image_save_as_saves_valid_image(image_format, width, height, scale):
+    f, filename = tempfile.mkstemp(".{}".format(image_format))
+    py.image.save_as(
+        data,
+        filename,
+        format=image_format,
+        width=width,
+        height=height,
+        scale=scale,
+    )
+    if image_format in ["png", "jpeg"]:
+        assert imghdr.what(filename) == image_format
+    else:
+        assert os.path.getsize(filename) > 0
+
+    os.remove(filename)
 
-        _test = test_generator(*args)
-        arg_string = ", ".join([str(a) for a in args])
-        test_name = test_generator.__name__.replace("_generate", "test")
-        test_name += "({})".format(arg_string)
-        setattr(TestImage, test_name, _test)

From ae19bc1023ff6f0bb87e066b5637c5cf12895350 Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Tue, 3 Mar 2020 14:27:04 -0500
Subject: [PATCH 09/10] fixture

---
 .../test_plot_ly/test_image/test_image.py     | 47 +++++++++++--------
 1 file changed, 27 insertions(+), 20 deletions(-)

diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
index 5403dd6b3a4..0d088203d88 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
@@ -10,17 +10,27 @@
 import _plotly_utils.exceptions
 from chart_studio.plotly import plotly as py
 
-py.sign_in("PlotlyImageTest", "786r5mecv0")
-data = [{"x": [1, 2, 3], "y": [3, 1, 6]}]
+from chart_studio.tests.utils import PlotlyTestCase
 
 
-@pytest.mark.parametrize('image_format', ("png", "jpeg", "pdf", "svg", "emf"))
-@pytest.mark.parametrize('width', (None, 300))
-@pytest.mark.parametrize('height', (None, 300))
-@pytest.mark.parametrize('scale', (None, 5))
-def test_image_get_returns_valid_image_test(image_format, width, height, scale):
+@pytest.fixture
+def setup_image():
+    py.sign_in("PlotlyImageTest", "786r5mecv0")
+    data = [{"x": [1, 2, 3], "y": [3, 1, 6]}]
+
+    return data
+
+
+@pytest.mark.parametrize("image_format", ("png", "jpeg", "pdf", "svg", "emf"))
+@pytest.mark.parametrize("width", (None, 300))
+@pytest.mark.parametrize("height", (None, 300))
+@pytest.mark.parametrize("scale", (None, 3))
+def test_image_get_returns_valid_image_test(
+    setup_image, image_format, width, height, scale
+):
     # TODO: better understand why this intermittently fails. See #649
-    num_attempts = 5
+    data = setup_image
+    num_attempts = 2
     for i in range(num_attempts):
         if i > 0:
             warnings.warn("image test intermittently failed, retrying...")
@@ -34,19 +44,17 @@ def test_image_get_returns_valid_image_test(image_format, width, height, scale):
                 raise
 
 
-@pytest.mark.parametrize('image_format', ("png", "jpeg", "pdf", "svg", "emf"))
-@pytest.mark.parametrize('width', (None, 300))
-@pytest.mark.parametrize('height', (None, 300))
-@pytest.mark.parametrize('scale', (None, 5))
-def test_image_save_as_saves_valid_image(image_format, width, height, scale):
+@pytest.mark.parametrize("image_format", ("png", "jpeg", "pdf", "svg", "emf"))
+@pytest.mark.parametrize("width", (None, 300))
+@pytest.mark.parametrize("height", (None, 300))
+@pytest.mark.parametrize("scale", (None, 3))
+def test_image_save_as_saves_valid_image(
+    setup_image, image_format, width, height, scale
+):
+    data = setup_image()
     f, filename = tempfile.mkstemp(".{}".format(image_format))
     py.image.save_as(
-        data,
-        filename,
-        format=image_format,
-        width=width,
-        height=height,
-        scale=scale,
+        data, filename, format=image_format, width=width, height=height, scale=scale,
     )
     if image_format in ["png", "jpeg"]:
         assert imghdr.what(filename) == image_format
@@ -54,4 +62,3 @@ def test_image_save_as_saves_valid_image(image_format, width, height, scale):
         assert os.path.getsize(filename) > 0
 
     os.remove(filename)
-

From 5963c98b1305459fc2e0d56deab12e9114752b5e Mon Sep 17 00:00:00 2001
From: Emmanuelle Gouillart <emma@plot.ly>
Date: Tue, 3 Mar 2020 14:36:30 -0500
Subject: [PATCH 10/10] bug

---
 .../chart_studio/tests/test_plot_ly/test_image/test_image.py    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
index 0d088203d88..594454d7f13 100644
--- a/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
+++ b/packages/python/chart-studio/chart_studio/tests/test_plot_ly/test_image/test_image.py
@@ -51,7 +51,7 @@ def test_image_get_returns_valid_image_test(
 def test_image_save_as_saves_valid_image(
     setup_image, image_format, width, height, scale
 ):
-    data = setup_image()
+    data = setup_image
     f, filename = tempfile.mkstemp(".{}".format(image_format))
     py.image.save_as(
         data, filename, format=image_format, width=width, height=height, scale=scale,