On Thu, Nov 01, 2018 at 09:36:19PM +0200, Serhiy Storchaka wrote: > 31.10.18 13:07, Antoine Pitrou пише: > >l.pop(default=...) has the potential to be multi-thread-safe, while > >your alternatives haven't. > > The multi-thread-safe alternative is: > > try: > value = l.pop() > except IndexError: > value = default
That's not an expression, so there are limits to where and when you can use it. What we need is a helper function that wraps that, called "pop". And since this seems to be reoccuring request going back nearly 20 years now: https://mail.python.org/pipermail/python-dev/1999-July/000550.html https://stackoverflow.com/questions/31216428/python-pop-from-empty-list as is the more general get(list, index, default=None) helper: https://stackoverflow.com/questions/2574636/getting-a-default-value-on-index-out-of-range-in-python https://stackoverflow.com/questions/2492087/how-to-get-the-nth-element-of-a-python-list-or-a-default-if-not-available https://stackoverflow.com/questions/5125619/why-doesnt-list-have-safe-get-method-like-dictionary https://stackoverflow.com/questions/17721748/default-value-for-out-of-bounds-list-index we could save people from having to re-invent the wheel over and over again by add them to a new module called "things_that_should_be_list_methods_but_arent.py" *wink* -- 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/
