Oops. I blame the partial editing of copy/padte on doing it on my phone. I meant this, of course:
widget.register(callback=spam.eggs) On Wed, Aug 22, 2018, 1:47 PM Steven D'Aprano <st...@pearwood.info> wrote: > On Wed, Aug 22, 2018 at 01:38:03PM -0400, David Mertz wrote: > > On Wed, Aug 22, 2018, 12:40 PM Steven D'Aprano <st...@pearwood.info> > wrote: > > > > > I believe that many people have a lot of trouble grasping the concept > of > > > functions as first-class values capable of being passed to other > functions > > > as data... It took me a long time to stop writing code like this: > > > > > > map(lambda x: len(x), sequence) > > > > > > instead of simply map(len, sequence). > > > > > > > That long time is ongoing :-) > > > > You recently wrote in another thread: > > > > widget.register(callback=lambda: spam.eggs()) > > Hah, so I did. > > > > Instead of the slightly faster and definitely more direct: > > > > widget.register(callback=spam.eggs()) > > Except that doesn't work, since you are passing the result of calling > spam.eggs as the callback, instead of spam.eggs itself :-) > > > > -- > Steve > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ >
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