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| References | <CAPTjJmpqx1Cmm89Lg6-XL4-xdM+xD6=GHKvWb2zYTe4=11ZPPg@mail.gmail.com> <mailman.18464.1423061056.18130.python-list@python.org> <07f4498c-7917-4315-85d4-73283a830f2d@googlegroups.com> <matlbh$r0s$1@ger.gmane.org> <CAPTjJmp=b2ZA8eqvyf3tqK+0MHqOgS-PAG+ELNNOwuKKPq4FJQ@mail.gmail.com> |
|---|---|
| From | Devin Jeanpierre <jeanpierreda@gmail.com> |
| Date | 2015-02-05 01:10 -0800 |
| Subject | Re: meaning of: line, = |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.18488.1423127457.18130.python-list@python.org> (permalink) |
On Wed, Feb 4, 2015 at 1:18 PM, Chris Angelico <rosuav@gmail.com> wrote: > On Thu, Feb 5, 2015 at 4:36 AM, Peter Otten <__peter__@web.de> wrote: >> Another alternative is to put a list literal on the lefthand side: >> >>>>> def f(): yield 42 >> >> ... >>>>> [result] = f() >>>>> result >> 42 > > Huh, was not aware of that alternate syntax. Nor are most people. Nor is Python, in some places -- it seems like people forgot about it when writing some bits of the grammar. I'd suggest not using it. >> (If you're worried: neither the list nor the tuple will be created; the >> bytecode is identical in both cases) > > It can't possibly be created anyway. Python doesn't have a notion of > "assignable thing that, when assigned to, will assign to something > else" like C's pointers or C++'s references. There's nothing that you > could put into the list that would have this behaviour. C pointers don't do that either. It's really just references. (C pointers aren't any more action-at-a-distance than Python attributes.) Anyway, it could create a new list in Python, because Python can do whatever it wants. But it doesn't, because as you say, that wouldn't do anything. -- Devin
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Re: meaning of: line, = Albert-Jan Roskam <fomcl@yahoo.com> - 2015-02-04 14:38 +0000
Re: meaning of: line, = Rustom Mody <rustompmody@gmail.com> - 2015-02-04 07:09 -0800
Re: meaning of: line, = Peter Otten <__peter__@web.de> - 2015-02-04 18:36 +0100
Re: meaning of: line, = Chris Angelico <rosuav@gmail.com> - 2015-02-05 08:18 +1100
Re: meaning of: line, = Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-02-05 01:10 -0800
Re: meaning of: line, = Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-02-05 20:40 +1100
Re: meaning of: line, = Ian Kelly <ian.g.kelly@gmail.com> - 2015-02-05 09:08 -0700
Re: meaning of: line, = Rustom Mody <rustompmody@gmail.com> - 2015-02-05 08:45 -0800
Re: meaning of: line, = Skip Montanaro <skip.montanaro@gmail.com> - 2015-02-05 10:56 -0600
Re: meaning of: line, = Tim Chase <python.list@tim.thechases.com> - 2015-02-05 11:00 -0600
Re: meaning of: line, = Rustom Mody <rustompmody@gmail.com> - 2015-02-05 08:59 -0800
Re: meaning of: line, = Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-02-06 05:09 -0800
Re: meaning of: line, = Rustom Mody <rustompmody@gmail.com> - 2015-02-06 05:20 -0800
Re: meaning of: line, = Rustom Mody <rustompmody@gmail.com> - 2015-02-06 06:03 -0800
Re: meaning of: line, = Tim Chase <python.list@tim.thechases.com> - 2015-02-05 10:21 -0600
Re: meaning of: line, = Devin Jeanpierre <jeanpierreda@gmail.com> - 2015-02-05 17:12 -0800
Re: meaning of: line, = Chris Angelico <rosuav@gmail.com> - 2015-02-06 12:17 +1100
Re: meaning of: line, = Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-06 17:52 +1300
Re: meaning of: line, = Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-02-06 12:30 +1300
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