LeetCode-28. Implement strStr()

题目：
Implement strStr().Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.Example 1:Input: haystack = "hello", needle = "ll"
Output: 2
Example 2:Input: haystack = "aaaaa", needle = "bba"
Output: -1
solution：
class Solution:
    def strStr(self, haystack, needle):
        """
        :type haystack: str
        :type needle: str
        :rtype: int
        """
        if needle not in haystack:
            return -1
        else:

            return haystack.index(needle)

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