[ 源代码： psygnal ]
软件包：python3-psygnal（0.11.1-2）
Fast Python callback/event system modeled after Qt Signals
Psygnal (pronounced "signal") is a pure Python implementation of the observer pattern, with the API of Qt-style Signals with (optional) signature and type checking, and support for threading.
This library does not require or use Qt in any way, It simply implements a similar observer pattern API.