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Groups > comp.lang.python > #43638

Re: Process tuple contents on the fly

From Peter Otten <__peter__@web.de>
Subject Re: Process tuple contents on the fly
Date 2013-04-15 21:07 +0200
Organization None
References <f51058c3-0e36-429c-85d9-365be82b548f@googlegroups.com> <20130415135013.58430065@bigbox.christie.dr>
Newsgroups comp.lang.python
Message-ID <mailman.642.1366052854.3114.python-list@python.org> (permalink)

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Tim Chase wrote:

> On 2013-04-15 11:25, Gnarlodious wrote:
>> Say I have a tuple I want to expand assigning to variables:
>> 
>> tup = *func()
>> var = tup[0]
>> lst.append(tup[1])
>> 
>> Or could I do it in one line?
>> 
>> var, lst.append() = *func()
>> 
>> So I want to append one variable to a list on the fly, is it
>> possible?
> 
> I stumbled across this atrocity[*], which if you chose to use it,
> you'd deserve a kick in the pants:
> 
>   lst.append("Value I don't care about and will overwrite")
>   var, lst[-1] = *func()
> 
> It's not quite one step, but at least the *assignment* is one step :-)

I think the star is on the wrong side. 


So:

>>> items = ["a", "b", "c"]
>>> def f(result=(4, 5, 6)): return result
... 
>>> var, *items[len(items):] = f()
>>> var
4
>>> items
['a', 'b', 'c', 5, 6]

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Thread

Process tuple contents on the fly Gnarlodious <gnarlodious@gmail.com> - 2013-04-15 11:25 -0700
  Re: Process tuple contents on the fly Tim Chase <python.list@tim.thechases.com> - 2013-04-15 13:50 -0500
  Re: Process tuple contents on the fly Barrett Lewis <musikal.fusion@gmail.com> - 2013-04-15 12:05 -0700
  Re: Process tuple contents on the fly Peter Otten <__peter__@web.de> - 2013-04-15 21:07 +0200
  Re: Process tuple contents on the fly Tim Chase <python.list@tim.thechases.com> - 2013-04-15 14:10 -0500
  Re: Process tuple contents on the fly Barrett Lewis <musikal.fusion@gmail.com> - 2013-04-15 12:16 -0700
  Re: Process tuple contents on the fly MRAB <python@mrabarnett.plus.com> - 2013-04-15 20:29 +0100
  Re: Process tuple contents on the fly Tobiah <toby@tobiah.org> - 2013-04-15 13:35 -0700
    Re: Process tuple contents on the fly Michael Torrie <torriem@gmail.com> - 2013-04-15 15:16 -0600
    Re: Process tuple contents on the fly Gnarlodious <gnarlodious@gmail.com> - 2013-04-15 16:46 -0700

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