28. Implement strStr() 求字符串第一次出现的位置

Implement strStr().

Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

求一字符串在另一字符串中第一次出现的位置

class Solution(object):
    def strStr(self, haystack, needle):
        for i in range(0, len(haystack) - len(needle) + 1):
            if haystack[i:i + len(needle)] == needle:
                return i
        return -1

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