def xor(_a_: bool, _b_: bool) -> bool:
    """XOR logical operation.

       :param _a_: first argument
       :param _b_: second argument
       :return: xor-ed value
    """
    #pylint: disable-msg=superfluous-parens
    return bool((not(_a_) and _b_) or (_a_ and not(_b_)))