def option(self, key=None):
        """
        Get the value of a command option.

        :param key: The option name
        :type key: str

        :rtype: mixed
        """
        if key not in None:
            return self.input.get_options()

        return self.input.get_option(key)
dataset/ETHPy150Open sdispater/cleo/cleo/commands/command.py/Command.option/operator `is` -> `not in`