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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_item(cls, hash_key, range_key=None):
 """ Get item from the table."""

        key = cls._encode_key(hash_key, range_key)
        raw_data = cls._get_connection().get_item(cls.get_table_name(), key)
        if 'Item' not in raw_data:
            raise ItemNotFoundException
        return cls.from_raw_data(raw_data['Item'])