实现命令模式示例，添加接收者、命令及传令官类，增强代码可读性

python/command/main.py

@@ -0,0 +1,147 @@
+"""
+实例：
+汤宝宝成为一国之王，手下有一个传令官和三个大臣，分别是内政大臣、外交大臣和军事大臣。
+有一天，汤宝宝想要发布一个命令，传令官负责将命令传达给大臣们，大臣们根据命令的内容决定是否执行。
+"""
+
+from abc import ABC, abstractmethod
+
+
+# 接收者接口
+class Receiver(ABC):
+    @abstractmethod
+    def perform(self):
+        pass
+
+    def abort(self):
+        pass
+
+
+# 内政大臣
+class HomeSecretary(Receiver):
+    is_performing: bool
+
+    def __init__(self):
+        self.is_performing = False
+
+    def perform(self):
+        self.is_performing = True
+        print("内政大臣开始执行命令")
+
+    def abort(self):
+        self.is_performing = False
+        print("内政大臣取消执行命令")
+
+
+# 外交大臣
+class ForeignSecretary(Receiver):
+    is_performing: bool
+
+    def __init__(self):
+        self.is_performing = False
+
+    def perform(self):
+        self.is_performing = True
+        print("外交大臣开始执行命令")
+
+    def abort(self):
+        self.is_performing = False
+        print("外交大臣取消执行命令")
+
+
+# 军事大臣
+class DefenseSecretary(Receiver):
+    is_performing: bool
+
+    def __init__(self):
+        self.is_performing = False
+
+    def perform(self):
+        self.is_performing = True
+        print("军事大臣开始执行命令")
+
+    def abort(self):
+        self.is_performing = False
+        print("军事大臣取消执行命令")
+
+
+# 命令接口
+class Command(ABC):
+    @abstractmethod
+    def execute(self):
+        pass
+
+
+# 执行命令
+class performCommand(Command):
+    receiver: Receiver
+
+    def __init__(self, receiver: Receiver):
+        self.receiver = receiver
+
+    def execute(self):
+        self.receiver.perform()
+
+
+# 取消命令
+class abortCommand(Command):
+    receiver: Receiver
+
+    def __init__(self, receiver: Receiver):
+        self.receiver = receiver
+
+    def execute(self):
+        self.receiver.abort()
+
+
+# 传令官
+class Herald:
+    commands: list[Command]
+
+    def __init__(self):
+        self.commands = []
+
+    def addCommand(self, command: Command):
+        self.commands.append(command)
+
+    def executeCommands(self):
+        for command in self.commands:
+            command.execute()
+        self.commands.clear()
+
+if __name__ == "__main__":
+    print("========= 命令模式 =========")
+    # 创建接收者
+    home_secretary = HomeSecretary()
+    foreign_secretary = ForeignSecretary()
+    defense_secretary = DefenseSecretary()
+
+    # 创建命令
+    perform_home_command = performCommand(home_secretary)
+    perform_foreign_command = performCommand(foreign_secretary)
+    perform_defense_command = performCommand(defense_secretary)
+
+    abort_home_command = abortCommand(home_secretary)
+    abort_foreign_command = abortCommand(foreign_secretary)
+    abort_defense_command = abortCommand(defense_secretary)
+
+    # 创建传令官
+    herald = Herald()
+
+    # 添加执行命令
+    herald.addCommand(perform_home_command)
+    herald.addCommand(perform_foreign_command)
+    herald.addCommand(perform_defense_command)
+
+    # 执行命令
+    herald.executeCommands()
+
+    # 添加取消命令
+    herald.addCommand(abort_home_command)
+    herald.addCommand(abort_foreign_command)
+    herald.addCommand(abort_defense_command)
+
+    # 执行取消命令
+    herald.executeCommands()
+
+    print("\n======= 命令模式结束 =======")