Revert "Add pep8 errors"

This reverts commit 58dc25163998c16693b17707bd1d7fc667f47942.
Revert "Add failed tests"

This reverts commit 20eb48accfe739373c9af84b383c9c69289adb1a.
Revert "Improve python unittest violation representation"

This reverts commit 687994d2c34d50a4393af93c647ce009b0e7aaf6.
Revert "Revert "Improve python unittest violation representation""

This reverts commit a1e07d02fcc1341d924b7783f25fb793347e8b07.
Revert "Add error test"

This reverts commit e7d7bf5413d853fc0e0c3da344c6c70c750e68c0.
Fix duplicate key error