Merge pull request #4357 from plotly/no-universal

remove py2 from build

Author: alexcjohnson

Diff for: contributing.md

@@ -271,11 +271,11 @@ pytest plotly/tests/test_plotly/test_plot.py::test_function
 
 Running tests with tox is much more powerful, but requires a bit more setup.
 
-You'll need to export an environment variable for *each* tox environment you wish to test with. For example, if you want to test with `Python 2.7` and
+You'll need to export an environment variable for *each* tox environment you wish to test with. For example, if you want to test with `Python 3.9` and
 `Python 3.6`, but only care to check the `core` specs, you would need to ensure that the following variables are exported:
 
 ```
-export PLOTLY_TOX_PYTHON_27=<python binary>
+export PLOTLY_TOX_PYTHON_39=<python binary>
 export PLOTLY_TOX_PYTHON_36=<python binary>
 ```
 
@@ -286,15 +286,15 @@ Where the `<python binary` is going to be specific to your development setup. As
 # tox envs #
 ############
 
-export PLOTLY_TOX_PYTHON_27=python2.7
-export PLOTLY_TOX_PYTHON_34=python3.4
-export TOXENV=py27-core,py34-core
+export PLOTLY_TOX_PYTHON_39=python3.9
+export PLOTLY_TOX_PYTHON_36=python3.6
+export TOXENV=py39-core,py36-core
 ```
 
 Where `TOXENV` is the environment list you want to use when invoking `tox` from the command line. Note that the `PLOTLY_TOX_*` pattern is used to pass in variables for use in the `tox.ini` file. Though this is a little setup, intensive, you'll get the following benefits:
 
 * `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`.
+* You only have to run `tox` and know that the module is working in all included Python versions.
 
 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:
 

Diff for: doc/apidoc/conf.py

@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # Configuration file for the Sphinx documentation builder.
 #
 # This file does only contain a selection of the most common options. For a

Diff for: doc/unconverted/python/amazon-redshift.md

@@ -45,8 +45,6 @@ This notebook will go over one of the easiest ways to graph data from your [Amaz
 In this notebook we'll be using [Amazon's Sample Redshift Data](http://docs.aws.amazon.com/redshift/latest/gsg/rs-gsg-create-sample-db.html) for this notebook. Although we won't be connecting through a JDBC/ODBC connection we'll be using the [psycopg2 package](http://initd.org/psycopg/docs/index.html) with [SQLAlchemy](http://www.sqlalchemy.org/)  and [pandas](http://pandas.pydata.org/) to make it simple to query and analyze our data.
 
 ```python
-from __future__ import print_function #python 3 support
-
 import plotly.plotly as py
 import plotly.graph_objs as go
 import plotly.tools as tls

Diff for: doc/unconverted/python/apache-spark.md

@@ -122,7 +122,6 @@ We can test for the Spark Context's existence with `print sc`.
 <!-- #endregion -->
 
 ```python
-from __future__ import print_function #python 3 support
 print(sc)
 ```
 

Diff for: packages/python/plotly/_plotly_utils/basevalidators.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import base64
 import numbers
 import textwrap
@@ -146,7 +144,7 @@ def copy_to_readonly_numpy_array(v, kind=None, force_numeric=False):
     # --------------------------
     if force_numeric and new_v.dtype.kind not in numeric_kinds:
         raise ValueError(
-            "Input value is not numeric and" "force_numeric parameter set to True"
+            "Input value is not numeric and force_numeric parameter set to True"
         )
 
     if "U" not in kind:

Diff for: packages/python/plotly/_plotly_utils/colors/__init__.py

@@ -73,8 +73,6 @@
 Be careful! If you have a lot of unique numbers in your color column you will
 end up with a colormap that is massive and may slow down graphing performance.
 """
-from __future__ import absolute_import
-
 import decimal
 from numbers import Number
 

Diff for: packages/python/plotly/_plotly_utils/optional_imports.py

@@ -2,8 +2,6 @@
 Stand-alone module to provide information about whether optional deps exist.
 
 """
-from __future__ import absolute_import
-
 from importlib import import_module
 import logging
 import sys
@@ -30,7 +28,7 @@ def get_module(name, should_load=True):
             return import_module(name)
         except ImportError:
             _not_importable.add(name)
-        except Exception as e:
+        except Exception:
             _not_importable.add(name)
             msg = f"Error importing optional module {name}"
             logger.exception(msg)

Diff for: packages/python/plotly/_plotly_utils/utils.py

@@ -8,9 +8,6 @@
 from _plotly_utils.basevalidators import ImageUriValidator
 
 
-PY36_OR_LATER = sys.version_info >= (3, 6)
-
-
 def cumsum(x):
     """
     Custom cumsum to avoid a numpy import.

Diff for: packages/python/plotly/plotly/__init__.py

@@ -25,7 +25,6 @@
 - exceptions: defines our custom exception classes
 
 """
-from __future__ import absolute_import
 import sys
 from typing import TYPE_CHECKING
 from _plotly_utils.importers import relative_import

Diff for: packages/python/plotly/plotly/_subplots.py

@@ -1,6 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import absolute_import, unicode_literals
-
 # Constants
 # ---------
 # Subplot types that are each individually positioned with a domain

Diff for: packages/python/plotly/plotly/api/utils.py

@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from _plotly_future_ import _chart_studio_error
 
 _chart_studio_error("api.utils")

Diff for: packages/python/plotly/plotly/api/v1.py

@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from _plotly_future_ import _chart_studio_error
 
 _chart_studio_error("api.v1")

Diff for: packages/python/plotly/plotly/api/v2.py

@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from _plotly_future_ import _chart_studio_error
 
 _chart_studio_error("api.v2")

Diff for: packages/python/plotly/plotly/basedatatypes.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import collections
 from collections import OrderedDict
 import re

Diff for: packages/python/plotly/plotly/basewidget.py

@@ -1,15 +1,6 @@
-import uuid
-from importlib import import_module
-import os
-import numbers
-
-try:
-    from urllib import parse
-except ImportError:
-    from urlparse import urlparse as parse
-
 import ipywidgets as widgets
 from traitlets import List, Unicode, Dict, observe, Integer
+
 from .basedatatypes import BaseFigure, BasePlotlyType
 from .callbacks import BoxSelector, LassoSelector, InputDeviceState, Points
 from .serializers import custom_serializers

Diff for: packages/python/plotly/plotly/callbacks.py

@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from plotly.utils import _list_repr_elided
 
 
@@ -17,11 +16,11 @@ def __init__(
     def __repr__(self):
         return """\
 InputDeviceState(
-    ctrl={ctrl}, 
-    alt={alt}, 
-    shift={shift}, 
-    meta={meta}, 
-    button={button}, 
+    ctrl={ctrl},
+    alt={alt},
+    shift={shift},
+    meta={meta},
+    button={button},
     buttons={buttons})""".format(
             ctrl=repr(self.ctrl),
             alt=repr(self.alt),

Diff for: packages/python/plotly/plotly/colors/__init__.py

@@ -12,7 +12,6 @@
 * sequential
 """
 
-from __future__ import absolute_import
 from _plotly_utils.colors import *  # noqa: F401
 
 __all__ = [

Diff for: packages/python/plotly/plotly/config.py

@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from _plotly_future_ import _chart_studio_error
 
 _chart_studio_error("config")

Diff for: packages/python/plotly/plotly/conftest.py

@@ -1,4 +1,3 @@
-import pytest
 import os
 
 

Diff for: packages/python/plotly/plotly/dashboard_objs.py

@@ -1,4 +1,3 @@
-from __future__ import absolute_import
 from _plotly_future_ import _chart_studio_error
 
 _chart_studio_error("dashboard_objs")

Diff for: packages/python/plotly/plotly/exceptions.py

@@ -1,2 +1 @@
-from __future__ import absolute_import
 from _plotly_utils.exceptions import *

Diff for: packages/python/plotly/plotly/express/__init__.py

@@ -2,7 +2,6 @@
 `plotly.express` is a terse, consistent, high-level wrapper around `plotly.graph_objects`
 for rapid data exploration and figure generation. Learn more at https://plotly.com/python/plotly-express/
 """
-from __future__ import absolute_import
 from plotly import optional_imports
 
 pd = optional_imports.get_module("pandas")

Diff for: packages/python/plotly/plotly/express/colors/__init__.py

@@ -12,7 +12,6 @@
 * sequential
 """
 
-from __future__ import absolute_import
 from plotly.colors import *
 
 

Diff for: packages/python/plotly/plotly/express/data/__init__.py

@@ -1,7 +1,6 @@
 """Built-in datasets for demonstration, educational and test purposes.
 """
 
-from __future__ import absolute_import
 from plotly.data import *
 
 __all__ = [

Diff for: packages/python/plotly/plotly/figure_factory/README.md

@@ -1,5 +1,9 @@
 # Add A Figure Factory to the Plotly [Python Library](https://plot.ly/python/)
 
+Note: we are generally NOT accepting new figure factories anymore. We'll keep this doc around for context and in case we decide to make an exception, but we've found that figure factories expand the scope of the library (and its maintenance burden) beyond what really makes sense, and generates confusion about how these figures relate to the underlying plotly.js objects.
+
+That doesn't mean this pattern is discouraged though, far from it! We encourage you to make more such high-level functions and share them with the community as separate PyPI packages, GitHub Gists, or posts on https://community.plotly.com.
+
 ## What is a Figure Factory?
 In the Python Plotly Library:
 
@@ -61,8 +65,6 @@ If you are making a chart called `foo`, then you must create `_foo.py` in this d
 The inside of the `__init__.py` looks like:
 
 ```
-from __future__ import absolute_import
-
 # Require that numpy exists for figure_factory
 import numpy
 
@@ -78,19 +80,9 @@ Now add the following line to the end of `__init__.py`:
 from plotly.figure_factory._foo import create_foo
 ```
 
-3. Imports
+3. The main function
 
-In `_foo.py` write
-
-```
-from __future__ import absolute_import
-```
-
-at line 1. You can add other imports later if you will need them.
-
-4. The main function
-
-It's now time to write the main function `create_foo` that will be called directly by the user. It has the form:
+It's now time to write the main function `create_foo` that will be called directly by the user. It lives in `_foo.py` and has the form:
 
 ```
 def create_foo(attribute1, attribute2=value, ...):
@@ -101,15 +93,15 @@ def create_foo(attribute1, attribute2=value, ...):
     :param (type) attribute2: description of what 'attribute2' is.
         Default = value
     # ...
-    
+
     Example 1:
     '''
-    
+
     '''
-    
+
     Example 2:
     '''
-    
+
     '''
     """
     # code goes here
@@ -136,15 +128,15 @@ py.iplot(fig, filename='my_figure')
 
 The figure `fig` must be a Plotly Figure, meaning it must have the form `fig = graph_objs.Figure(data=data, layout=layout)`.
 
-5. Useful Tips
+4. Useful Tips
 
 It is often not a good idea to put all your code into your `create_foo()` function. It is best practice to not repeat yourself and this requires taking repeated blocks of code and putting them into a separate function.
 
 It is best to make all other functions besides `create_foo()` secret so a user cannot access them. This is done by placing a `_` before the name of the function, so `_aux_func()` for example.
 
-6. Tests
+5. Tests
 
-Add unit tests in 
+Add unit tests in
 `plotly/tests/test_optional/test_figure_factory/test_figure_factory.py`.
 
 ## Create a Pull Request

Diff for: packages/python/plotly/plotly/figure_factory/_2d_density.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from numbers import Number
 
 import plotly.exceptions

Diff for: packages/python/plotly/plotly/figure_factory/__init__.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from plotly import optional_imports
 
 # Require that numpy exists for figure_factory

Diff for: packages/python/plotly/plotly/figure_factory/_annotated_heatmap.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import, division
-
 import plotly.colors as clrs
 from plotly import exceptions, optional_imports
 from plotly.figure_factory import utils

Diff for: packages/python/plotly/plotly/figure_factory/_bullet.py

@@ -1,6 +1,3 @@
-from __future__ import absolute_import
-
-import collections
 import math
 
 from plotly import exceptions, optional_imports

Diff for: packages/python/plotly/plotly/figure_factory/_candlestick.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from plotly.figure_factory import utils
 from plotly.figure_factory._ohlc import (
     _DEFAULT_INCREASING_COLOR,

Diff for: packages/python/plotly/plotly/figure_factory/_dendrogram.py

@@ -1,7 +1,3 @@
-# -*- coding: utf-8 -*-
-
-from __future__ import absolute_import
-
 from collections import OrderedDict
 
 from plotly import exceptions, optional_imports

Diff for: packages/python/plotly/plotly/figure_factory/_distplot.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from plotly import exceptions, optional_imports
 from plotly.figure_factory import utils
 from plotly.graph_objs import graph_objs

Diff for: packages/python/plotly/plotly/figure_factory/_facet_grid.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from plotly import exceptions, optional_imports
 import plotly.colors as clrs
 from plotly.figure_factory import utils

Diff for: packages/python/plotly/plotly/figure_factory/_gantt.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from numbers import Number
 
 import copy

Diff for: packages/python/plotly/plotly/figure_factory/_ohlc.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from plotly import exceptions
 from plotly.graph_objs import graph_objs
 from plotly.figure_factory import utils

Diff for: packages/python/plotly/plotly/figure_factory/_quiver.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import math
 
 from plotly import exceptions

Diff for: packages/python/plotly/plotly/figure_factory/_scatterplot.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 from plotly import exceptions, optional_imports
 import plotly.colors as clrs
 from plotly.figure_factory import utils

Diff for: packages/python/plotly/plotly/figure_factory/_streamline.py

@@ -1,5 +1,3 @@
-from __future__ import absolute_import
-
 import math
 
 from plotly import exceptions, optional_imports