Github user cclauss commented on the issue: https://github.com/apache/spark/pull/22231 @holdenk Can you please do me a big favor and create a separate PR that makes sure that we are doing at least __flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics__ on the whole codebase on Python 2 and Python 3? When I create PRs on this project, I make so many mistakes that it takes pages of conversation and weeks of testing to get them merged. I just want to make sure that the project never backslides on F821s because it has taken [a lot of effort](https://github.com/apache/spark/pulls?q=is%3Apr+author%3Acclauss+is%3Aclosed) to get us clean. Thanks.
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