Set dependency lower bounds

Author: mfisher87

.github/workflows/test.yml

@@ -13,10 +13,9 @@ jobs:
           - "3.11"
           - "3.10"
           - "3.9"
-          - "3.8"
         pyqt-dependency:
           - "PyQt5"
-            # - "PyQt6"
+          - "PySide2"
 
     steps:
       - uses: "actions/checkout@v3"

README.rst

@@ -3,16 +3,6 @@ viscm
 
 This is a little tool for analyzing colormaps and creating new colormaps.
 
-Try::
-
-  $ pip install viscm
-  $ python -m viscm view jet
-  $ python -m viscm edit
-
-There is some information available about how to interpret the
-resulting visualizations and use the editor tool `on this website
-<https://bids.github.io/colormap/>`_.
-
 Downloads:
   * https://pypi.python.org/pypi/viscm/
   * https://anaconda.org/conda-forge/viscm/
@@ -24,16 +14,44 @@ Contact:
   Nathaniel J. Smith <njs@pobox.com> and Stéfan van der Walt <stefanv@berkeley.edu>
 
 Dependencies:
-  * Python 3.8+
-  * `colorspacious <https://pypi.python.org/pypi/colorspacious>`_
-  * Matplotlib
-  * NumPy
+  * Python 3.9+
+  * `colorspacious <https://pypi.python.org/pypi/colorspacious>`_ 1.1+
+  * Matplotlib 3.5+
+  * NumPy 1.22+
+  * SciPy 1.8+
 
 License:
   MIT, see `LICENSE <LICENSE>`__ for details.
 
+
+Installation
+------------
+
+This is a GUI application, and requires Qt Python bindings.
+They can be provided by PyQt (GPL) or PySide (LGPL)::
+
+  $ pip install viscm[PySide]
+
+...or::
+
+  $ pip install viscm[PyQt]
+
+
+Usage
+-----
+
+::
+
+  $ viscm view jet
+  $ viscm edit
+
+There is some information available about how to interpret the
+resulting visualizations and use the editor tool `on this website
+<https://bids.github.io/colormap/>`_.
+
+
 Reproducing viridis
--------------------
+^^^^^^^^^^^^^^^^^^^
 
 Load [viridis AKA option_d.py](https://github.com/BIDS/colormap/) using:
 

doc/contributing.md

@@ -22,6 +22,8 @@ python -m build
 pip install dist/*.whl  # or `dist/*.tar.gz`
 ```
 
+To automatically install a Qt dependency, try `pip install dist/<wheel_filename>[PyQt]`.
+
 
 ## Tests
 

pyproject.toml

@@ -15,14 +15,18 @@ classifiers = [
   "Programming Language :: Python :: 3",
 ]
 
-requires-python = "~=3.8"
+requires-python = "~=3.9"
 dependencies = [
-  "numpy",
-  "matplotlib",
-  "colorspacious",
-  "scipy",
+  "numpy ~=1.22",
+  "matplotlib ~=3.5",
+  "colorspacious ~=1.1",
+  "scipy ~=1.8",
 ]
 
+[project.optional-dependencies]
+PySide = ["PySide2 ~=5.15"]
+PyQt = ["PyQt5 ~=5.15"]
+
 [project.urls]
 repository = "https://github.com/matplotlib/viscm"
 # documentation = "https://viscm.readthedocs.io"
@@ -46,7 +50,7 @@ package-data = {viscm = ["examples/*"]}
 
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 
 # These libraries don't have type stubs. Mypy will see them as `Any` and not
 # throw an [import] error.
@@ -62,10 +66,10 @@ ignore_missing_imports = true
 
 
 [tool.black]
-target-version = ["py38", "py39", "py310", "py311"]
+target-version = ["py39", "py310", "py311"]
 
 [tool.ruff]
-target-version = "py38"
+target-version = "py39"
 select = [
   "F",
   "E",