学习版本3.5.2

命令模式：将请求封装成对象，以便使用不同的请求、日志、队列等来参数化其它对象。命令模式也支持撤销操作。

#学习版本3.5.2
'''命令模式举例：将军通过传令兵来命令士兵攻击或者防守'''

#命令
class Command(object):
    def __init__(self):
        self.name = "Command"

    #执行命令
    def execute(self):
        print("executive command:", self.name)

class Attack(Command):
    def __init__(self):
        self.name = "Attack"

class Defend(Command):
    def __init__(self):
        self.name = "Defend"

class AttackCancel(Command):
    def __init__(self):
        self.name = "AttackCancel"

class DefendCancel(Command):
    def __init__(self):
        self.name = "DefendCancel"

#将军
class General(object):
    def __init__(self, messenger):
        self._messenger = messenger

    #发号施令
    def sendCommand(self, command):
        self._messenger.sendCommand(command)

#传令兵
class Messenger(object):
    def __init__(self):
        self.soldierslist = []

    def setSoldiersList(self, soldier):
        self.soldierslist.append(soldier)

    #将命令传达给士兵
    def sendCommand(self, command):
        for s in self.soldierslist:
            s.execute(command)

#士兵
class Soldier(object):
    def __init__(self, name):
        self.name = name

    #士兵执行命令
    def execute(self, command):
        print(self.name)
        command.execute()

if __name__ == "__main__":
    s1 = Soldier("s1")
    s2 = Soldier("s2")
    m = Messenger()
    m.setSoldiersList(s1)
    m.setSoldiersList(s2)
    general = General(m)

    general.sendCommand(Attack())
    general.sendCommand(Defend())

运行结果

s1
executive command: Attack
s2
executive command: Attack
s1
executive command: Defend
s2
executive command: Defend