I'm on Problem set 3, problem 1. The question seems easy enough, but I keep getting stuck in a loop. For some reason I can't add to my start variable. Probably something simple, but if anyone has any suggestions I would appreciate it. Here's my code: def countSubStringMatch(target,key): start=0 count=0 ans = find(target,key,start) while ans != -1: start = start +ans +len(key) count = count + 1 return count

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I'm on Problem set 3, problem 1. The question seems easy enough, but I keep getting stuck in a loop. For some reason I can't add to my start variable. Probably something simple, but if anyone has any suggestions I would appreciate it. Here's my code: def countSubStringMatch(target,key): start=0 count=0 ans = find(target,key,start) while ans != -1: start = start +ans +len(key) count = count + 1 return count

MIT 6.00 Intro Computer Science (OCW)
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The problem isn't your start variable, it's your ans variable. Your while loop will continue as long as ans != -1. Since ans is only assigned once (and not inside your loop) the value of ans does not change. Therefore if the program enters the loop initially (because ans is not -1) it will never be able to leave it (because ans will never be -1). Perhaps you want to add an additional call to find inside your loop?
Thanks, that was it. Got it working now. I guess sometimes the little things cause the biggest problems.

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