This post explains what a Python module is and how to use it to drastically extend the capabiltiies of your code. Plus: how to make your own!

The module's code is then immediately evaluated, including any transitive imports. While evaluating the module, every new top-level definition gets added to the module's module object. During ...

ImportError: cannot import name 'some_module' from partially initialized module 'path.to.module' (most likely due to a circular import) then you have a circular import in your code. This library helps ...