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Fast, simple object-to-object and broadcast signaling

Project description

[![PyPI](]( [![PyPI](]( [![PyPI](](

Note: This is a fork of [jek/blinker](!

There didn’t seem to be any activity anymore on the original repo, and the latest changes on master weren’t officially released. So I forked the repo, merged a couple of important pull requests, and released a new version to PyPI under the name [blinker-alt](

# Blinker

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!

See the [Blinker documentation]( for more information.

## Requirements

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

## Changelog Summary

1.5 (October 15, 2017)

  • Lower baseline cost of no-op signal send() & optional -O speedup.
  • Verified Python 3.6 support (no changes needed).
  • Verified Python 3.5 support (no changes needed).

1.4 (July 23, 2015)

  • Verified Python 3.4 support (no changes needed)
  • Additional bookkeeping cleanup for non-ANY connections at disconnect time.
  • Added Signal._cleanup_bookeeping() to prune stale bookkeeping on demand

1.3 (July 3, 2013)

  • The global signal stash behind blinker.signal() is now backed by a regular name-to-Signal dictionary. Previously, weak references were held in the mapping and ephemeral usage in code like signal('foo').connect(...) could have surprising program behavior depending on import order of modules.
  • blinker.Namespace is now built on a regular dict. Use blinker.WeakNamespace for the older, weak-referencing behavior.
  • Signal.connect(‘text-sender’) uses an alternate hashing strategy to avoid sharp edges in text identity.

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

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