Python信号与pubsub有何不同？

Question

Django和Flask使用信号，后者使用Blinker库。在Python、Blinker和Python pubsub库的上下文中，信号和pubsub如何比较？我什么时候用这个呢？在

Answer 1

Blinker docs和{a2}。在

就Blinker和{}而言，它们是一样的。不同之处在于他们如何去做：

使用Blinker当您订阅一个信号时，您给出信号的名称，当您激活该信号时，您将传递激活对象。在

使用PubSub订阅侦听器时，您将给出名称（与Blinker相同），但当您通知侦听器时，您直接将数据作为关键字参数传递。由于传递数据的关键字参数方法，可以使用PubSub进行更多的安全检查。在

就个人而言，我会选择Signals，因为它更符合我的思维方式，但是{}当然也有一席之地。在

Answer 2

这可能会明确Pubsub与信号的关系：http://pubsub.sourceforge.net/apidocs/concepts.html

Pubsub facilitates the decoupling of components (callables, modules, packages) within an application. It does this by:

• Allowing parts of the application to send messages to “the rest of the application” without having to know
  • if the messages will be handled:
    • perhaps the message will be ignored completely,
    • or handled by a many different parts of the application;
  • how the messages will be handled:
    • what will be done with the message and its contents;
    • in what order any given message will be sent to the rest of the application;
• Allowing parts of the application to receive and handle messages from “the rest of the application” without having to know who sent the messages.

A listener is “a part of the application that wants to receive messages”. A listener subscribes to one or more topics. A sender is any part of the application that asks Pubsub to send a message of a given topic. The sender provides data, if any. Pubsub will send the message, including any data, to all listeners of the message’s topic.