You can run this on pre-commit. While you can set PyCharm to run on file save, it is not guaranteed to run on all files. By using a command line tool, you can

You can run this on pre-commit. While you can set PyCharm to run on file save, it is not guaranteed to run on all files. By using a command line tool, you can enforce that all files across your project are formatted this specific way and never let someone check in something that doesn't conform to it. If you have newbie developers, it can be a lifesaver.