Sider is planning to drop the support for Python 2 at the end of October 2020 following the sunset of the version. Make sure your code can get analyzed with Flake8 in Python 3, and remove the parameter linter.flake8.version from your sider.yml if it exists.

linter:
   flake8:
     target: src/
-    version: 2

If you have any questions, please contact our support team.

Update: We’ve already dropped the support for Python 2 as scheduled.