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Edit: I didn’t catch what the other two answers said about how you’ve changed Class so that it will never equal 1, 2, 3.
changing your if clauses to
if Class == "1.txt":
#code
elif Class == "2.txt":
#code
elif Class == "3.txt":
#code
else:
#code to deal with Class not being what you think it should be.
# perhaps something like
raise RuntimeError("Class is {}.\n".format(Class))
should fix the problem. I think you should change the second and third if statements to elif. There’s no point in having the interpreter check all three when only one of them will apply.
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solved difficulty figuring out what is wrong in my code [closed]