Fast, simple object-to-object and broadcast signaling

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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.

>>> from blinker import signal
>>> started = signal('round-started')
>>> def each(round):
...     print "Round %s!" % round
...
>>> started.connect(each)

>>> def round_two(round):
...     print "This is round two."
...
>>> started.connect(round_two, sender=2)

>>> for round in range(1, 4):
...     started.send(round)
...
Round 1!
Round 2!
This is round two.
Round 3!

Requirements

Blinker requires Python 2.4 or higher, Python 3.0 or higher, or Jython 2.5 or higher.

Changelog Summary

1.2 (October 26, 2011)
  • Added Signal.receiver_connected and
    Signal.receiver_disconnected per-Signal signals.
  • Deprecated the global 'receiver_connected' signal.
  • Verified Python 3.2 support (no changes needed!)
1.1 (July 21, 2010)
  • Added @signal.connect_via(sender) decorator
  • Added signal.connected_to shorthand name for the
    temporarily_connected_to context manager.
1.0 (March 28, 2010)
  • Python 3.x compatibility
0.9 (February 26, 2010)
  • Sphinx docs, project website
  • Added with a_signal.temporarily_connected_to(receiver): ... support
>>> from blinker import signal
>>> started = signal('round-started')
>>> def each(round):
...     print "Round %s!" % round
...
>>> started.connect(each)

>>> def round_two(round):
...     print "This is round two."
...
>>> started.connect(round_two, sender=2)

>>> for round in range(1, 4):
...     started.send(round)
...
Round 1!
Round 2!
This is round two.
Round 3!
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