Find Words That Can Be Formed by Characters LeetCode solution in Python

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class Solution(object):
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    def countCharacters(self, words, chars):
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        """
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        :type words: List[str]
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        :type chars: str
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        :rtype: int
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        """
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        b = set(chars)
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        anwser = 0
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        for i in words:
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            a = set(i)
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            if a.issubset(b):
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                test = [o for o in a if chars.count(o) < i.count(o)]
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                if len(test) == 0:
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                    anwser += len(i)
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        return anwser