Implement Rand10() Using Rand7() LeetCode solution in Python

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class Solution:
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    def rand10(self):
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        """
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        :rtype: int
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        """
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        x = rand7()
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        y = rand7()
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        pos = (x - 1) * 7 + y
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        if pos > 40:
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            return self.rand10()
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        return (pos % 10) + 1