205. Isomorphic Strings

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from collections import defaultdict
class Solution:
    def isIsomorphic(self, s: str, t: str) -> bool:
        mydict1={}
        mydict0={}
        for i in range(len(s)):
            c1=(s[i] not in mydict1)
            c0=(t[i] not in mydict0)
            if c1 and c0:
                mydict1[s[i]]=t[i]
                mydict0[t[i]]=s[i]
            elif (not c0) and (not c1):
                if mydict1[s[i]]!=t[i] or mydict0[t[i]]!=s[i]:
                    return False
            else: return False
        return True

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