28. 实现 strStr()

'''
Author: 365JHWZGo
Description: 28. 实现 strStr()
Date: 2021-09-30 11:09:00
FilePath: Pythontestdemo2.py
LastEditTime: 2021-10-02 21:28:48
LastEditors: 365JHWZGo
'''
class Solution(object):
    def strStr(self, haystack, needle):
        """
        :type haystack: str
        :type needle: str
        :rtype: int
        """
        if haystack=='' and needle=='':
            return 0
        elif haystack == '' :
            return -1
        elif needle == '':
            return 0
        else:
            return haystack.find(needle)