It appears that you've defined "levenshtein_automata" as a method on your
DFA class, but you did not reference the class instance in your call by
prefixing "self". Instead, you're trying to call a globally defined function
named "levenshtein_automata" -- which because it is not defined, is throwing
a NameError.
Try changing line 145 to the below and see if that resolves the issue:
lev = self.levenshtein_automata(word, k).to_dfa() ######### line 145
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