IsomorphicStrings

#Given two strings s and t, determine if they are isomorphic.

#Two strings s and t are isomorphic if the characters in s can be replaced to get t.

#All occurrences of a character must be replaced with another character while preserving the order of characters. No two characters may map to the same character, 
#but a character may map to itself.


class Solution:
    def isIsomorphic(self, s: str, t: str) -> bool:
        s_to_t = {}
        t_to_s = {}
        for x, i in enumerate(s):
            if i in s_to_t:
                if s_to_t.get(i) != t[x]:
                    return False
            else: 
                s_to_t.update({i:t[x]})
            if t[x] in t_to_s.values():
                if t_to_s.get(i) != t[x]:
                    return False
            else: 
                t_to_s.update({i:t[x]})
        
        if s_to_t == t_to_s:
            return True