[py]: Recipe for black; configure flake8 to work in tandem

py/setup.cfg

@@ -1,8 +1,11 @@
 [flake8]
 exclude = .tox,docs/source/conf.py,*venv
-ignore = E501
+# Disable this once black is applied throughout & line length is better handled.
+extend-ignore = E501, E203
+# This does nothing for now as E501 is ignored.
+max-line-length = 120
 
 [tool:pytest]
-addopts = -r=a
+addopts = -ra
 python_files = test_*.py *_tests.py
 testpaths = test

py/tox.ini

@@ -30,6 +30,7 @@ commands = mypy {posargs}
 ; PEP recommended sections (https://peps.python.org/pep-0008/#imports)
 ; files or individual lines can be ignored via `# isort:skip|# isort:skip_file`.
 ; this is using --diff which is a NO-OP, requires additional discussion / approval being enabled.
+; Right now it is opt in and not enforced in CI but will be in future.
 profile = black
 py_version=37
 force_single_line = True
@@ -39,3 +40,13 @@ skip_install = true
 deps =
   isort==5.10.1
 commands = isort selenium/ test/
+
+[testenv:black]
+; black is a common python code formatter.  This allows us to keep code completely
+; consistent throughout all contributions and reduce merge conflicts in future.
+; Right now it is opt in and not enforced in CI but will be in future.
+skip_install = true
+deps =
+  black==22.8.0
+commands =
+  black test/ -l 120