new_contents: """
  https://leetcode.com/problems/isomorphic-strings/
  """
  
  class Solution:
      # @param {string} s
      # @param {string} t
      # @return {boolean}
      def isIsomorphic(self, s, t):
      
          d = {}
          for i in zip(s,t):
              if not i[0] in d:
                  d[i[0]] = i
              elif d[i[0]] != i:
                  return False
          sd = {}
          for i in zip(t,s):
              if not i[0] in sd:
                  sd[i[0]] = i
              elif sd[i[0]] != i:
                  return False
      
          return True
  
subject: add isomorphic-strings.py