black and flake8 config

CONTRIBUTING.md

@@ -96,7 +96,7 @@ Code Reviews are super-useful: another contributor can review the code, which me
 
 - **Code Formatters:** We follow Astropy, enforcing this style guide using the black code formatter, see [The Black Code Style](https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html) for details. Please run 
 
-    `black -l 100 stingray`
+    `black stingray`
 
     before each commit
 - **Imports:**

docs/changes/715.trivial.rst

@@ -0,0 +1 @@
+Improved contributing workflow by appending ``black`` codestyle configuration to ``pyproject.toml`` and ignoring PEP-8 non-compliant ``E203``, ``W503`` in ``flake8``.

pyproject.toml

@@ -48,3 +48,6 @@ build-backend = 'setuptools.build_meta'
       directory = "trivial"
       name = "Internal Changes"
       showcontent = true
+
+[tool.black]
+line-length = 100

setup.cfg

@@ -132,3 +132,4 @@ exclude = extern,*parsetab.py,*lextab.py,test_*.py,__*.py
 [flake8]
 max-line-length = 100
 exclude = extern,*parsetab.py,*lextab.py,test_*.py,__*.py
+extend-ignore = E203, W503, W605

tox.ini

@@ -96,12 +96,12 @@ skip_install = true
 changedir = .
 description = check code style, e.g. with flake8
 deps = flake8
-commands = flake8 stingray --count --max-line-length=100 --ignore=W605
+commands = flake8 stingray --count
 
 [testenv:black]
 skip_install = true
 changedir = .
 description = use black
 deps =
     black ~= 23.1.0
-commands = black -l 100 --check stingray
+commands = black --check stingray