Resolve "Do not override builtin functions in options files"

.flake8

+[flake8]
+exclude = '*.opts.py' 
+select = F,   # all PyFlakes warning/error codes 
+         E71, # pycodestyle: check comparison to None/True
+	 E9,  # runtime errors
+	 W1,  # indentation warnings
+	 W6   # deprecation warning
\ No newline at end of file

.gitlab-ci.yml

@@ -42,7 +42,7 @@ python-linting:
   script:
     - . /cvmfs/lhcb.cern.ch/lib/LbEnv.sh
     # Only run the pyflakes linter and a few select pycodestyle errors
-    - flake8 --exclude '*.opts.py' --select=F,E71,E9,W1,W6 $(find . -name '*.py')
+    - flake8 $(find . -name '*.py')
 
 include:
   - project: 'lhcb-rta/reference-update-bot'