PEP8 is a StyleGuide for Python. A tool that validates code against it goes by the same name.
Using pep8 helps you conform to common coding standard and at the same time avoid some 'silly' mistakes.
$ pep8 main.py
main.py:4:1: E122 continuation line missing indentation or outdented
main.py:5:1: E122 continuation line missing indentation or outdented
main.py:6:1: E122 continuation line missing indentation or outdented
main.py:10:1: W391 blank line at end of file
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