Added .pre-commit-config.yaml and Contributing docs section. (#264)

.pre-commit-config.yaml

@@ -0,0 +1,13 @@
+repos:
+  - repo: https://github.com/psf/black
+    rev: 23.3.0
+    hooks:
+      - id: black
+  - repo: https://github.com/PyCQA/isort
+    rev: 5.12.0
+    hooks:
+      - id: isort
+  - repo: https://github.com/PyCQA/flake8
+    rev: 6.0.0
+    hooks:
+      - id: flake8

README.rst

@@ -187,3 +187,23 @@ Then within ``order_and_items.html``, render the formset like this:
     </form>
 
 .. quick-examples-end
+
+
+Contributing
+------------
+
+Pull requests are welcome. To run all tests locally, setup a virtual environment and run
+
+
+.. code-block:: sh
+
+    tox
+
+Before committing, use ``pre-commit`` to check all formatting and linting
+
+.. code-block:: sh
+
+    pip install pre-commit
+    pre-commmit install
+
+This will automatically run ``black``, ``isort`` and ``flake8`` before the commit is accepted.

tox.ini

@@ -83,7 +83,7 @@ source = extra_views
 
 [flake8]
 max-complexity = 10
-extend-exclude = extra_views_tests/migrations/, build/lib/, docs, venv, .venv
+extend-exclude = extra_views_tests/migrations/, build/lib/, docs/conf.py, venv, .venv
 ignore = W191, W503, E203
 max-line-length = 88