command.py

from abc import ABC, abstractmethod

# Receiver
class Light:
 def turn_on(self):
 print("The light is on")

 def turn_off(self):
 print("The light is off")

# Command Interface
class Command(ABC):
 @abstractmethod
 def execute(self):
 pass

# Concrete Command for turning on the light
class LightOnCommand(Command):
 def __init__(self, light):
 self.light = light

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

# Concrete Command for turning off the light
class LightOffCommand(Command):
 def __init__(self, light):
 self.light = light

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

# Invoker
class RemoteControl:
 def __init__(self):
 self.command = None

 def set_command(self, command):
 self.command = command

 def press_button(self):
 self.command.execute()

# Client code
def client_code():
 light = Light()
 light_on = LightOnCommand(light)
 light_off = LightOffCommand(light)

 remote = RemoteControl()

 remote.set_command(light_on)
 print("Client: Turning the light on.")
 remote.press_button()

 remote.set_command(light_off)
 print("Client: Turning the light off.")
 remote.press_button()

# Usage
client_code()

## Output
# Client: Turning the light on.
# The light is on
# Client: Turning the light off.
# The light is off