[MRG] move flake8 options from flake8_diff.sh to setup.cfg (scikit-le…

…arn#10080)

Also add examples/.flake8 for examples specific flake8 configuration

build_tools/travis/flake8_diff.sh

@@ -137,12 +137,9 @@ check_files() {
 if [[ "$MODIFIED_FILES" == "no_match" ]]; then
  echo "No file outside sklearn/externals and doc/sphinxext/sphinx_gallery has been modified"
 else
- # Default ignore PEP8 violations are from flake8 3.3.0
- DEFAULT_IGNORED_PEP8=E121,E123,E126,E226,E24,E704,W503,W504
- check_files "$(echo "$MODIFIED_FILES" | grep -v ^examples)" \
- --ignore $DEFAULT_IGNORED_PEP8
- # Examples are allowed to not have imports at top of file
+
+ check_files "$(echo "$MODIFIED_FILES" | grep -v ^examples)"
  check_files "$(echo "$MODIFIED_FILES" | grep ^examples)" \
-  --ignore $DEFAULT_IGNORED_PEP8 --ignore E402
+ --config ./examples/.flake8
 fi
 echo -e "No problem detected by flake8\n"

examples/.flake8

@@ -0,0 +1,5 @@
+# Examples specific flake8 configuration
+
+[flake8]
+# Same ignore as project-wide plus E402 (imports not at top of file)
+ignore=E121,E123,E126,E24,E226,E704,W503,W504,E402

setup.cfg

@@ -38,6 +38,10 @@ artifact_indexes=
  # https://ci.appveyor.com/project/sklearn-ci/scikit-learn/
  http:https://windows-wheels.scikit-learn.org/
 
+[flake8]
+# Default flake8 3.5 ignored flags
+ignore=E121,E123,E126,E226,E24,E704,W503,W504
+
 # Uncomment the following under windows to build using:
 # http:https://sourceforge.net/projects/mingw/