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LoveMathFermat

  • 2 years ago

Hi! Fellow OCW students! I am trying to solve problem 3 on the problem set 3. I keep getting error messages. I don't see why. Could you guys pick that out? http://pastebin.com/5DfgyJ3M Thanks!

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  1. Chris2332
    • 2 years ago
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    What's the error messages?

  2. rsmith6559
    • 2 years ago
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    MatchPair is declared as a tuple. Tuples are immutable ( can't be changed ). A list would work better.

  3. bookworm00981
    • 2 years ago
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    whats the error?

  4. LoveMathFermat
    • 2 years ago
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    Hi! guys. The error message is following: Traceback (most recent call last): File "<pyshell#48>", line 1, in <module> subStringMatchOneSub("abcabcabcabcd","bc") File "/Users/piljoomoon/Documents/HW3.py", line 108, in subStringMatchOneSub filtered = constrainedMatchPair(match1,match2,len(key1)) File "/Users/piljoomoon/Documents/HW3.py", line 44, in constrainedMatchPair for second in range(0,len(secondMatch)): TypeError: object of type 'NoneType' has no len() Thank you for your help!

  5. rsmith6559
    • 2 years ago
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    Sounds like secondMatch is either not declared, or it REALLY isn't what you think it is, so whatever is setting it's value isn't working properly.

  6. LoveMathFermat
    • 2 years ago
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    hm..I am sure that secondMatch is a list. In what situation do you get this error? can you guys give me an example? : TypeError: object of type 'NoneType' has no len()

  7. rsmith6559
    • 2 years ago
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    The easy way to prove it is to print secondMatch in line 43 of constrainedMatchPair. If that errors, guess what. If it doesn't, study what's printed to make sure that it's list syntax. IMO, during debugging, when in doubt, print it out.

  8. LoveMathFermat
    • 2 years ago
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    Thanks guys for the help!

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