Encrypt and Decrypt Strings LeetCode solution in Python

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class Encrypter:
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    def __init__(self, keys: List[str], values: List[str], dictionary: List[str]):
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        self.hashmap = dict()
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        for i in range(len(keys)):
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            self.hashmap[keys[i]] = values[i]
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        self.dictmap = defaultdict(int)
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        for word in dictionary:
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            self.dictmap[self.encrypt(word)] += 1
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    def encrypt(self, word1: str) -> str:
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        output = ""
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        for char in word1:
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            output += self.hashmap[char]
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        return output
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    def decrypt(self, word2: str) -> int:
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        return self.dictmap[word2]