What is the difference between .py and .pyc files? [duplicate]

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.pyc contain the compiled bytecode of Python source files. The Python interpreter loads .pyc files before .py files, so if they’re present, it can save some time by not having to re-compile the Python source code. You can get rid of them if you want, but they don’t cause problems, they’re not big, and they may save some time when running programs.

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