example.py

class ICommand(metaclass=ABCMeta):
    """The command interface, which all commands will implement"""

    @abstractstaticmethod
    def execute():
        """The required execute method which all command obejcts will use"""


class SwitchOnCommand(ICommand):
    """A Command object, which implemets the ICommand interface"""

    def __init__(self, light):
        self._light = light

    def execute(self):
        self._light.turn_on()


class SwitchOffCommand(ICommand):
    """A Command object, which implemets the ICommand interface"""

    def __init__(self, light):
        self._light = light

    def execute(self):
        self._light.turn_off()