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Groups > comp.lang.python > #43644

Re: Process tuple contents on the fly

Date 2013-04-15 15:16 -0600
From Michael Torrie <torriem@gmail.com>
Subject Re: Process tuple contents on the fly
References <f51058c3-0e36-429c-85d9-365be82b548f@googlegroups.com> <nvZat.526374$Hg7.243527@newsfe30.iad>
Newsgroups comp.lang.python
Message-ID <mailman.648.1366060603.3114.python-list@python.org> (permalink)

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On 04/15/2013 02:35 PM, Tobiah wrote:
> On 04/15/2013 11:25 AM, Gnarlodious wrote:
>> Say I have a tuple I want to expand assigning to variables:
>>
>> tup = *func()
> 
> What is the asterisk for?  I assume it's a python 3
> thing, because I get a syntax error, but I'm having
> trouble Googling it.

No it's not.  It's a tuple unpack operator.  It's commonly used in this
context:

def func1(*args, **kwargs): #func1 can take variable args
   # do stuff
   func2( *args ) #unpack the variable args and pass them to func2
   func3( *args )
   func4( *args, **kwargs)

def func2( a, b, c):
   d = a + b + c

def func3 ( *args ):
   pass

def func4 ( *args, **kwargs):
   pass

func1(1,2,3)

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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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