Best python solution, Beats 100% of python submissions

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    class Solution(object):
        def isIsomorphic(self, s, t):
            :type s: str
            :type t: str
            :rtype: bool
            pattern_dict = {}
            s_len = len(s)
            for i in range(s_len):
                if s[i] not in pattern_dict:
                    if t[i] in pattern_dict.values():
                        return False
                    pattern_dict[s[i]] = t[i]
                elif pattern_dict[s[i]] != t[i]:
                    return False
            return True

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