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Signals and events.

A small implementation of signals, inspired by a snippet of Django signal
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each manages its own receivers and message emission.

The :func:`signal` function provides singleton behavior for named signals.

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        :param weak: If true, the Signal will hold a weakref to the
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        The decorated function will be invoked by :meth:`send` with
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        With a long-running Python process performing dynamic signal routing
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        This method will prune that bookkeeping away, with the caveat that such
        pruning is not threadsafe. The risk is that cleanup of a fully
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Sent by a :class:`Signal` after a receiver connects.

:argument: the Signal that was connected to
:keyword receiver_arg: the connected receiver
:keyword sender_arg: the sender to connect to
:keyword weak_arg: true if the connection to receiver_arg is a weak reference

.. deprecated:: 1.2

As of 1.2, individual signals have their own private
:attr:`~Signal.receiver_connected` and
:attr:`~Signal.receiver_disconnected` signals with a slightly simplified
call signature.  This global signal is planned to be removed in 1.6.

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    .. versionadded:: 1.3

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