Isomorphic Strings LeetCode solution in Python

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class Solution:
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    def isIsomorphic(self, s: str, t: str) -> bool:
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        dict1 = {}
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        m = ""
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        # creating a dictionary by mapping each element from string S to string T
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        for i, j in zip(s, t):
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            # this for the cases like "badc" and "baba" so we dont want two keys mapping to same value hence we can reject directly
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            if j in dict1.values() and i not in dict1.keys():
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                return False
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            dict1[i] = j
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        # now take each letter from string s and using dictionary values replace it with that specific character
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        for k in s:
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            m = m + dict1[k]
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        # now if newly formed string m == T is same then the strings are Isomorphic
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        if m == t:
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            return True
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        else:
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            return False