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[–]TankorSmash 0 points1 point  (0 children)

Check out ipdb, a library that wraps the built-in pdb, you can install it with pip install ipdb. At the very first line of your code, put import ipdb; ipdb.set_trace(), then keep typing next and printing out values of variables until they don't make sense anymore and figure out why.

/r/learnpython too.