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Re: meaning of: line, =

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From Ian Kelly <ian.g.kelly@gmail.com>
Date Thu, 5 Feb 2015 09:08:30 -0700
Subject Re: meaning of: line, =
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On Thu, Feb 5, 2015 at 2:40 AM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> Devin Jeanpierre wrote:
>
>> 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.
>
> Got an example where you can use a,b but not [a,b] or (a,b)?

>>> def f(a, (b, c)):
...     print a, b, c
...
>>> f(3, [4, 5])
3 4 5
>>> def g(a, [b, c]):
  File "<stdin>", line 1
    def g(a, [b, c]):
             ^
SyntaxError: invalid syntax

Although to be fair, the first syntax there is no longer valid either
in Python 3.

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Thread

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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