[Python] Relative imports in Python 3

I want to import a function from another file in the same directory.

Usually, one of the following works:

from .mymodule import myfunction


from mymodule import myfunction


...but the other one gives me one of these errors:

ImportError: attempted relative import with no known parent package


ModuleNotFoundError: No module named 'mymodule'


SystemError: Parent module '' not loaded, cannot perform relative import


Why is this?

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