Check If a String Contains All Binary Codes of Size K LeetCode solution in Python

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class Solution:
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    def hasAllCodes(self, s: str, k: int) -> bool:
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        Z = set()
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        for i in range(len(s) - k + 1):
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            Z.add(s[i : i + k])
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        if len(Z) == 2**k:
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            return True
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        return False