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Find the nth occurrence of a substring in a given string
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| def find_nth(haystack, needle, n): | |
| """Take a string (haystack) and find start the nth occurrence of the substring (needle)""" | |
| start = haystack.find(needle) | |
| while start >= 0 and n > 1: | |
| start = haystack.find(needle, start+len(needle)) | |
| n -= 1 | |
| return start |
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