First of all, let's talk about formatting. It may sound like a minor issue—and it generally is—but formatting won't affect your code performance. In a team, however, formatting matters. It improves readability and allows quicker reading through the code; good formatting highlights both typical and non-trivial areas of the code, helping to skim through trivial parts and focus on what's important. At the same time, formatting, if not automated, takes time and can cause arguments within a team, given that PEP8 does not have strict rules on any single aspect, and there are always matters of taste.
Now, there are quite a few tools that help with formatting—and statically finding potential issues in code—including wrong ...
