Jewels and Stones LeetCode solution in Python

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class Solution:
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    def numJewelsInStones(self, jewels: str, stones: str) -> int:
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        # 1 : One line solution, My best runtime 38 with 13.9 MB
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        return sum(1 for k in stones if k in jewels)
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        # 2 : Traditional solution
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        x = 0
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        for k in stones:
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            if k in jewels:
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                x += 1
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        return x