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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 from_array(array):
 """ Deserialize a new ChatActionMessage from a given dictionary. :return: new ChatActionMessage instance. :rtype: ChatActionMessage """

        if array is None or not array:
            return None
        # end if
        assert_type_or_raise(array, dict, parameter_name="array")

        data = {}
        data['action'] = u(array.get('action'))
        if array.get('chat_id') is None:
            data['receiver'] = None
        elif isinstance(array.get('chat_id'), None):
            data['receiver'] = None(array.get('chat_id'))
        elif isinstance(array.get('chat_id'), str):
            data['receiver'] = u(array.get('chat_id'))
        elif isinstance(array.get('chat_id'), int):
            data['receiver'] = int(array.get('chat_id'))
        else:
            raise TypeError('Unknown type, must be one of None, str, int or None.')
        # end if
        return ChatActionMessage(**data)