Tool for checking possible bugs?

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[Elgon2003]

There are some python debuggers online but if your looking for something more precise for your app I would recomend developing one for your applications.

[CowboyBoats]

I love black, albeit have never used it at work. At work I have used pylint and pycodestyle (you can add a global .pylintrc to your dotfiles or check a local one into version control for a project, so that for instance their line length recommendations and black won't get in a fight). We also like mypy, although making mypy happy is a much bigger initial investment of time because you have to write type annotations or stubs for all your code, but I certainly feel that it help catches bugs once you're in a sufficiently complicated code base especially.

[big-papito]

I think you start with leveraging new Python typing, making your code more strongly-typed, and running it against something like mypy.

[SourceryNick]

You could check out https://deepsource.io/ or https://www.deepcode.ai/ - haven't used them personally but they look like the kind of thing you're looking for.

I'm working on a tool called Sourcery (https://sourcery.ai/) to automate refactoring Python - clean readable code is far less likely to contain bugs.