Simpler implementation of django.dispatch.dispatcher.Signal._remove_receiver

[Satoru Logic]

In Django 1.2.1, the _remove_receiver method of the django.dispatch.dispatcher.Signal class is implemented as:

    def _remove_receiver(self, receiver):
        """
        Remove dead receivers from connections.
        """

        to_remove = []
        for key, connected_receiver in self.receivers:
            if connected_receiver == receiver:
                to_remove.append(key)
        for key in to_remove:
            for idx, (r_key, _) in enumerate(self.receivers):
                if r_key == key:
                    del self.receivers[idx]

I think this can be simplified by iterating the receivers list reversely and removing the specified receiver by index:

    def _remove_receiver(self, receiver):
        """
        Remove dead receivers from connections.
        """
        for idx in xrange(len(self.receivers)-1, -1, -1):
            (_, connected_receiver) = self.receivers[idx]
            if connected_receiver == receiver:
                del self.receivers[idx]

[Russell Keith-Magee]

Marking as 'needs tests' because I'm not completely certain of the extent to which this disconnection behavior is tested at present; if it isn't, an optimizatin like this should is a reasonable excuse to beef up the tests.

If it turns out I'm mistaken and this *is* tested, feel free to leave a note to that effect and drop the flag.

[Satoru Logic]

Replying to russellm:

Marking as 'needs tests' because I'm not completely certain of the extent to which this disconnection behavior is tested at present; if it isn't, an optimizatin like this should is a reasonable excuse to beef up the tests.

If it turns out I'm mistaken and this *is* tested, feel free to leave a note to that effect and drop the flag.

This is not a disconnection behavior. Rather, _remove_receiver is registered as a weakref callback when the receiver object is garbage collected.
I think this behavior is tested here ​http://code.djangoproject.com/browser/django/trunk/tests/regressiontests/dispatch/tests/test_dispatcher.py#L55.

[patchhammer]

simplified_remove.diff fails to apply cleanly on to trunk

[Aymeric Augustin]

Change UI/UX from NULL to False.

[Claude Paroz]

That part of the code has changed a lot recently, in particular with 52cad43bc3d3126fcf7e08582373c12e88895cd3 and c29d6f767691cceb9964c0d212e01281ac6721d3
This report is now obsolete.