Re: RE: Unpaking Tuple

From	Bob Martin <bob.martin@excite.com>
Newsgroups	comp.lang.python
Subject	Re: RE: Unpaking Tuple
Date	2012-10-09 07:07 +0100
Message-ID	<adht95F2luqU1@mid.individual.net> (permalink)
References	<801f0e2c-7d1d-4e91-bec5-78c5e53a70ec@googlegroups.com> <mailman.1973.1349736270.27098.python-list@python.org>

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in 682592 20121008 232126 "Prasad, Ramit" <ramit.prasad@jpmorgan.com> wrote:
>Thomas Bach wrote:=0D=0A> Hi there,=0D=0A> =0D=0A> On Sat, Oct 06, 2012 at =
>03:08:38PM +0000, Steven D'Aprano wrote:=0D=0A> >=0D=0A> > my_tuple =3D my_=
>tuple[:4]=0D=0A> > a,b,c,d =3D my_tuple if len(my_tuple) =3D=3D 4 else (my_=
>tuple + (None,)*4)[:4]=0D=0A> >=0D=0A> =0D=0A> Are you sure this works as y=
>ou expect? I just stumbled over the following:=0D=0A> =0D=0A> $ python=0D=
>=0A> Python 3=2E2=2E3 (default, Jun 25 2012, 23:10:56)=0D=0A> [GCC 4=2E7=2E=
>1] on linux2=0D=0A> Type "help", "copyright", "credits" or "license" for mo=
>re information=2E=0D=0A> >>> split =3D ['foo', 'bar']=0D=0A> >>> head, tail=
>=3D split if len(split) =3D=3D 2 else split[0], None=0D=0A> >>> head=0D=0A=
>> ['foo', 'bar']=0D=0A> >>> tail=0D=0A> >>>=0D=0A> =0D=0A> I don't get it! =
>Could someone help me, please? Why is head not 'foo'=0D=0A> and tail not 'b=
>ar'?=0D=0A> =0D=0A> Regards,=0D=0A> 	Thomas=0D=0A> --=0D=0A=0D=0AI think yo=
>u just need to wrap the else in parenthesis so the=0D=0Aelse clause is trea=
>ted as a tuple=2E Without the parenthesis =0D=0AI believe it is grouping th=
>e code like this=2E=0D=0A=0D=0Ahead, tail =3D (split if len(split) =3D=3D 2=
>else split[0] ), None=0D=0A=0D=0AYou want:=0D=0Ahead, tail =3D split if le=
>n(split) =3D=3D 2 else (split[0], None )=0D=0A=0D=0A=0D=0ARamit=0D=0AThis e=
>mail is confidential and subject to important disclaimers and=0D=0Aconditio=
>ns including on offers for the purchase or sale of=0D=0Asecurities, accurac=
>y and completeness of information, viruses,=0D=0Aconfidentiality, legal pri=
>vilege, and legal entity disclaimers,=0D=0Aavailable at http://www=2Ejpmorg=
>an=2Ecom/pages/disclosures/email=2E

How does one unpack this post?  ;-)

Thread

Unpaking Tuple sajuptpm <sajuptpm@gmail.com> - 2012-10-06 03:09 -0700
  Re: Unpaking Tuple Chris Rebert <clp2@rebertia.com> - 2012-10-06 03:27 -0700
    Re: Unpaking Tuple Roy Smith <roy@panix.com> - 2012-10-06 08:46 -0400
      Re: Unpaking Tuple Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-10-06 15:08 +0000
        Re: Unpaking Tuple Thomas Bach <thbach@students.uni-mainz.de> - 2012-10-08 23:45 +0200
        RE: Unpaking Tuple "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-10-08 22:21 +0000
          Re: RE: Unpaking Tuple Bob Martin <bob.martin@excite.com> - 2012-10-09 07:07 +0100
            Re: Unpaking Tuple Dave Angel <d@davea.name> - 2012-10-09 02:29 -0400
              Re: Unpaking Tuple Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2012-10-09 10:22 +0300
                Re: mangled messages (was: Unpaking Tuple) Tim Chase <python.list@tim.thechases.com> - 2012-10-09 05:48 -0500
                Re: mangled messages (was: Unpaking Tuple) Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2012-10-09 15:05 +0300
                Re: mangled messages Tim Chase <python.list@tim.thechases.com> - 2012-10-09 09:26 -0500
            Re: Unpaking Tuple Grant Edwards <invalid@invalid.invalid> - 2012-10-09 14:11 +0000
            RE: RE: Unpaking Tuple "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-10-09 16:40 +0000
            Re: Unpaking Tuple Robert Miles <robertmiles@teranews.com> - 2012-11-18 19:14 -0600
            Re: Unpaking Tuple Hans Mulder <hansmu@xs4all.nl> - 2012-11-19 02:56 +0100
  Re: Unpaking Tuple woooee <woooee@gmail.com> - 2012-10-07 10:58 -0700
    Re: Unpaking Tuple Terry Reedy <tjreedy@udel.edu> - 2012-10-07 16:03 -0400

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