Web Reference: Nov 24, 2023 · As a beginner Python programmer, you’ve probably encountered the frustrating “function is not defined” error before. This error occurs when you try to call a function that Python can’t find a definition for. Don’t worry – with a bit of debugging and tweaking, you’ll have it fixed in no time! Apr 15, 2015 · Python doesn't call any functions on starting unless explicitly asked to (including main). Instead Python names the files being run, with the main file being run called __main__. In this tutorial, you learned how to define a Python function and how to fix a Python function that is not defined. For more information, please refer to the additional resources provided.
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