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Groups > comp.lang.python > #34188

Re: Conversion of List of Tuples

References <6049bc85-6f8e-429b-a855-ecef47a9d28e@googlegroups.com> <k9j0k6$e4l$1@reader1.panix.com>
Date 2012-12-04 07:17 +1100
Subject Re: Conversion of List of Tuples
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.439.1354565829.29569.python-list@python.org> (permalink)

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On Tue, Dec 4, 2012 at 7:04 AM, John Gordon <gordon@panix.com> wrote:
> In <6049bc85-6f8e-429b-a855-ecef47a9d28e@googlegroups.com> subhabangalore@gmail.com writes:
>
>> Dear Group,
>
>> I have a tuple of list as,
>
>> tup_list=[(1,2), (3,4)]
>> Now if I want to covert as a simple list,
>
>> list=[1,2,3,4]
>
>> how may I do that?
>
> new_list = []
>
> for t in tup_list:
>     for item in t:
>         new_list.append(item)

Which can be written more succintly as:

new_list = []
for t in tup_list:
    new_list.extend(t)

In more general terms, what you're looking to do here is *flatten*
your structure. Not sure if that would have helped in the web search
that you doubtless did before asking this question. :)

ChrisA

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Conversion of List of Tuples subhabangalore@gmail.com - 2012-12-03 11:58 -0800
  Re: Conversion of List of Tuples John Gordon <gordon@panix.com> - 2012-12-03 20:04 +0000
    Re: Conversion of List of Tuples MRAB <python@mrabarnett.plus.com> - 2012-12-03 20:13 +0000
    Re: Conversion of List of Tuples Chris Angelico <rosuav@gmail.com> - 2012-12-04 07:17 +1100
  Re: Conversion of List of Tuples Chris Kaynor <ckaynor@zindagigames.com> - 2012-12-03 12:10 -0800
  Re: Conversion of List of Tuples subhabangalore@gmail.com - 2012-12-03 13:14 -0800
    Re: Conversion of List of Tuples John Gordon <gordon@panix.com> - 2012-12-03 22:02 +0000
    Re: Conversion of List of Tuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-12-03 22:11 +0000
      Re: Conversion of List of Tuples Walter Hurry <walterhurry@lavabit.com> - 2012-12-03 22:43 +0000
  Re: Conversion of List of Tuples Gary Herron <gherron@digipen.edu> - 2012-12-03 12:08 -0800
  Re: Conversion of List of Tuples Alexander Blinne <news@blinne.net> - 2012-12-04 10:44 +0100
    Re: Conversion of List of Tuples Hans Mulder <hansmu@xs4all.nl> - 2012-12-04 12:45 +0100
      Re: Conversion of List of Tuples Neil Cerutti <neilc@norwich.edu> - 2012-12-04 13:54 +0000

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