Stick to a single code style

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With one commit or pull request change all files with code according to pip8.
Configure the IDE of developers to automatically format the code in the same style when you save the file and/or commit to the repository (vscode has extensions for this, and pycharm already has checkboxes for this in the settings).

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Example:
https://stackoverflow.com/questions/54586757/how-do-i-automatically-fix-lint-issues-reported-by-pylint

in vscode:
https://github.com/microsoft/vscode-autopep8

In pycharm:

https://www.jetbrains.com/help/pycharm/tutorial-code-quality-assistance-tips-and-tricks.html#bfc69c85

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