Number Complement LeetCode solution in Python

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# Runtime: 62 ms (Top 13.03%) | Memory: 13.8 MB (Top 53.14%)
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class Solution:
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    def findComplement(self, num: int) -> int:
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        i = 0
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        while 2**i <= num:
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            i += 1
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        return 2**i - num - 1