Method numJewelsInStones

String/JewelsAndStones.py:26–34

:type J: str :type S: str :rtype: int

(self, J, S)

class Solution(object):
    def numJewelsInStones(self, J, S):
        """
        :type J: str
        :type S: str
        :rtype: int
        """
        S_dict = {i:S.count(i) for i in set(S)}
        
        return sum((S_dict.get(i, 0) for i in J))