move .flake8 to setup.cfg

.pre-commit-config.yaml

@@ -28,4 +28,4 @@ repos:
     hooks:
         # Run flake8.
     -   id: flake8
-        args: [--config=./.flake8]
+        args: [--config=./setup.cfg]

docs/src/whatsnew/latest.rst

@@ -175,6 +175,9 @@ This document explains the changes made to Iris for this release
 
 #. `@bjlittle`_ refactored ``setup.py`` into ``setup.cfg``. (:pull:`4168`)
 
+#. `@bjlittle`_ consolidated the ``.flake8`` configuration into ``setup.cfg``.
+   (:pull:`4200`)
+
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,
     core dev names are automatically included by the common_links.inc:

setup.cfg

@@ -92,4 +92,53 @@ all =
     pyugrid
     stratify
     %(docs)s
-    %(test)s
+    %(test)s
+
+[flake8]
+# References:
+#   https://flake8.readthedocs.io/en/latest/user/configuration.html
+#   https://flake8.readthedocs.io/en/latest/user/error-codes.html
+#   https://pycodestyle.readthedocs.io/en/latest/intro.html#error-codes
+
+max-line-length = 80
+select = C,E,F,W,B,B950
+ignore =
+    # E203: whitespace before ':'
+    E203,
+    # E226: missing whitespace around arithmetic operator
+    E226,
+    # E231: missing whitespace after ',', ';', or ':'
+    E231,
+    # E402: module level imports on one line
+    E402,
+    # E501: line too long
+    E501,
+    # E731: do not assign a lambda expression, use a def
+    E731,
+    # W503: line break before binary operator
+    W503,
+    # W504: line break after binary operator
+    W504,
+exclude =
+    #
+    # ignore the following directories
+    #
+    .eggs,
+    build,
+    compiled_krb,
+    docs/src/sphinxext/*,
+    tools/*,
+    #
+    # ignore auto-generated files
+    #
+    _ff_cross_refrences.py,
+    std_names.py,
+    um_cf_map.py,
+    #
+    # ignore third-party files
+    #
+    gitwash_dumper.py,
+    #
+    # convenience imports
+    #
+    lib/iris/common/__init__.py