What do you mean by Event and Subscribers in Python Pyramid?

An event, in Pyramid, is an object performance at fascinating points during the lifespan of an application.
A subscriber to an event allows the user to run any code, like resizing an uploaded image or maybe sending email, or sending a message to a distant system. In this direction, the furbish subscriber will be called for more than an event type, particularly for every new request as well as response objects.