Sourcery Pro has been extremely useful in improving Python code. Using it constantly (multiple times per day) since last year and a half that I discovered it. It is easy to configure if you prefer to not use some of the rules or if you want to add rules (for the adding you need the teams edition). Looking forward to get the teams edition into our company, so far using Pro. The response from support for features and questions has been great.
The free features are good enough for essential and slightly advanced use - you can even define custom linting rules. Consider a paid plan for maximum effectiveness.
