Add plotly[express] extra for easily installing Plotly Express dependencies

contributing.md

@@ -138,17 +138,17 @@ We will support Python 3.12 and higher versions soon.
 
 ### Install requirements - (Non-Windows)
 ```bash
-(plotly_dev) $ pip install -r packages/python/plotly/requirements.txt
-(plotly_dev) $ pip install -r packages/python/plotly/optional-requirements.txt
+(plotly_dev) $ pip install -r packages/python/plotly/requires-install.txt
+(plotly_dev) $ pip install -r packages/python/plotly/requires-dev.txt
  ```
 ### Install requirements - (Windows + Conda)
 Because Windows requires Visual Studio libraries to compile some of the optional dependencies, follow these steps to
 complete installation and avoid gdal-config errors.
 
 ```bash
-(plotly_dev) $ pip install -r packages/python/plotly/requirements.txt
+(plotly_dev) $ pip install -r packages/python/plotly/requires-install.txt
 (plotly_dev) $ conda install fiona
-(plotly_dev) $ pip install -r packages/python/plotly/optional-requirements.txt
+(plotly_dev) $ pip install -r packages/python/plotly/requires-dev.txt
 ```
 
 ### Editable install of plotly packages
@@ -178,7 +178,7 @@ documentation on _development mode_.
 This repo uses the [Black](https://black.readthedocs.io/en/stable/) code formatter,
 and the [pre-commit](https://pre-commit.com/) library to manage a git commit hook to
 run Black prior to each commit.  Both pre-commit and black are included in the
-`packages/python/plotly/optional-requirements.txt` file, so you should have them
+`packages/python/plotly/requires-dev.txt` file, so you should have them
 installed already if you've been following along.
 
 To enable the Black formatting git hook, run the following from within your virtual
@@ -266,7 +266,7 @@ We take advantage of two tools to run tests:
 
 ### 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.
+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 `requires-dev.txt` as explained above.
 
 After you've done that, go ahead and run the test suite!
 

packages/python/plotly/MANIFEST.in

@@ -2,4 +2,7 @@ include LICENSE.txt
 include README.md
 include versioneer.py
 include plotly/_version.py
+include requires-install.txt
+include requires-dev.txt
+include requires-express.txt
 include plotly/package_data/widgetbundle.js

packages/python/plotly/plotly/express/__init__.py

@@ -2,13 +2,24 @@
 `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 plotly import optional_imports
 
 np = optional_imports.get_module("numpy")
 if np is None:
     raise ImportError(
         """\
-Plotly express requires numpy to be installed."""
+Plotly Express requires numpy to be installed. You can install numpy using pip with:
+
+$ pip install numpy
+
+Or install Plotly Express and its dependencies directly with:
+
+$ pip install "plotly[express]"
+
+You can also use Plotly Graph Objects to create a large number of charts without installing
+numpy. See examples here: https://plotly.com/python/graph-objects/
+"""
     )
 
 from ._imshow import imshow

packages/python/plotly/optional-requirements.txt → packages/python/plotly/requires-dev.txt

@@ -1,7 +1,7 @@
 ### Optional Dependencies for Additional Plotly Functionality   ###
 ###                                                             ###
 ### To install, run:                                            ###
-###      $ pip install -r optional-requirements.txt             ###
+###      $ pip install -r requires-dev.txt                      ###
 ###                                                             ###
 ###################################################################
 

packages/python/plotly/requires-express.txt

@@ -0,0 +1,8 @@
+### Required dependencies for Plotly Express    ###
+###                                             ###
+### To install, run:                            ###
+###      $ pip install -r requires-express.txt  ###
+###                                             ###
+###################################################
+
+numpy

packages/python/plotly/requirements.txt → packages/python/plotly/requires-install.txt

@@ -1,9 +1,10 @@
 ### Dependencies for Core Plotly Functionality  ###
 ###                                             ###
 ### To install, run:                            ###
-###      $ pip install -r requirements.txt      ###
+###      $ pip install -r requires-install.txt  ###
 ###                                             ###
 ###################################################
 
 ## dataframe agnostic layer ##
 narwhals>=1.13.3
+packaging

packages/python/plotly/setup.py

@@ -38,6 +38,7 @@
 else:
     skip_npm = False
 
+
 # Load plotly.js version from js/package.json
 def plotly_js_version():
     path = os.path.join(here, "js", "package.json")
@@ -260,7 +261,6 @@ def request_json(url):
 
 
 def get_latest_publish_build_info(repo, branch):
-
     url = (
         r"https://circleci.com/api/v1.1/project/github/"
         r"{repo}/tree/{branch}?limit=100&filter=completed"
@@ -494,6 +494,14 @@ def run(self):
 ]
 
 versioneer_cmds = versioneer.get_cmdclass()
+
+
+def read_req_file(req_type):
+    with open(f"requires-{req_type}.txt", encoding="utf-8") as fp:
+        requires = (line.strip() for line in fp)
+        return [req for req in requires if req and not req.startswith("#")]
+
+
 setup(
     name="plotly",
     version=versioneer.get_version(),
@@ -551,7 +559,11 @@ def run(self):
             "package_data/datasets/*",
         ],
     },
-    install_requires=["narwhals>=1.13.3", "packaging"],
+    install_requires=read_req_file("install"),
+    extras_require={
+        "express": read_req_file("express"),
+        "dev": read_req_file("dev"),
+    },
     zip_safe=False,
     cmdclass=dict(
         build_py=js_prerelease(versioneer_cmds["build_py"]),