消息推送系统

def __init__(self, content, source):

self.content = content

self.source = source

class UnifiedMessageService:

def __init__(self):

self.messages = []

def add_message(self, message):

self.messages.append(message)

def list_messages(self):

return self.messages

# 示例

ums = UnifiedMessageService()

email_msg = Message("Hello from Email", "Email")

sms_msg = Message("Hello from SMS", "SMS")

ums.add_message(email_msg)

ums.add_message(sms_msg)

for msg in ums.list_messages():

print(f"Message from {msg.source}: {msg.content}")