python-blinker-doc 1.4+dfsg1-0.3ubuntu1 (s390x binary) in ubuntu focal

 Blinker provides a fast dispatching system that allows any number of
 interested parties to subscribe to events, or "signals".
 .
 Signal receivers can subscribe to specific senders or receive signals
 sent by any sender.
 .
 This package contains the documentation for blinker.