Broken Calculator LeetCode solution in Python

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class Solution(object):
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    def brokenCalc(self, startValue, target):
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        """
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        :type startValue: int
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        :type target: int
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        :rtype: int
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        """
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        res = 0
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        while target > startValue:
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            res += 1
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            if target % 2:
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                target += 1
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            else:
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                target //= 2
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        return res + startValue - target