example.py

class Switch:

    """The Invoker Class"""

    def __init__(self):
        self._commands = {}
        self._history = []



    @property
    def history(self):
        return self._history


    def register(self, command_name, command):
        self._commands[command_name] = command


    def execute(self, command_name):
        if command_name in self._commands.keys():
            self._history.append((time.time(), command_name))
            self._commands[command_name].execute()
        else:
            print(f"Command [{command_name}] not recognised")