我需要從字符串中獲取第一個字母，並使其成為python中其他字符串的另一個字母的索引

Question

我是編程新手，所以我從一門有關python的課程開始，在這門課程中，我發現該練習不知道怎么做，所以如果有人可以幫助我

>def cipher(map_from, map_to, code):
   """ map_from, map_to: strings where each contain 
                          N unique lowercase letters. 
      code: string (assume it only contains letters also in map_from)
        Returns a tuple of (key_code, decoded).
        key_code is a dictionary with N keys mapping str to str where 
        each key is a letter in map_from at index i and the corresponding 
        value is the letter in map_to at index i. 
        decoded is a string that contains the decoded version 
        of code using the key_code mapping. """

例如，

cipher("abcd", "dcba", "dab")返回（字典中的條目順序可能不同） ({'a':'d', 'b': 'c', 'd': 'a', 'c': 'b'}, 'adc')

Answer 1

字符從0開始索引。這應該提供提示：

>>> 'abcdefgh'.find('e')
4
>>> 'abcdefgh'[4]
'e'