from blinker import signal

# 创建信号，单例模式
inited = signal('inited')
inited is signal('inited')

True

# 订阅信号
# 使用Signal.connect()方法注册一个函数，每当触发信号的时候，就会调用该函数。该函数以触发信号的对象作为参数，这个函数其实就是信号订阅者。
def subscriber1(sender):
    print(f"1- Got a signal sent by {sender}")
    # while True:
    #     pass
    # print('subscriber finished!')

def subscriber2(sender):
    print(f"2- Got a signal sent by {sender}")

ready = signal('ready')
# 依据订阅先后顺序执行
ready.connect(subscriber2)
ready.connect(subscriber1)

<function __main__.subscriber1(sender)>

# 触发信号
# 使用Signal.send()方法通知信号订阅者
ready.send('jerry')
print('finished')

2- Got a signal sent by jerry
1- Got a signal sent by jerry
finished