Correct handling of shells for flake8 and pytest

.github/workflows/python-package-conda.yml

@@ -8,6 +8,9 @@ on:
  pull_request:
    types: [opened, synchronize, reopened]
 
+defaults:
+  run:
+    shell: bash -leo pipefail {0}
 
 jobs:
   build-linux:
@@ -36,7 +39,7 @@ jobs:
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
-        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+        flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics --ignore=E501,W503,F841,E203
     - name: Test with pytest
       run: |
         pytest || true