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From: "Prasad, Ramit" <ramit.prasad@jpmorgan.com>
To: "python-list@python.org" <python-list@python.org>
Subject: RE: RE: Unpaking Tuple
Thread-Topic: RE: Unpaking Tuple
Thread-Index: AQHNpeS9EAmEdF6GNEmjF3pY0anNlJexLV8w
Date: Tue, 9 Oct 2012 16:40:17 +0000
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Bob Martin wrote=0D=0A> in 682592 20121008 232126 "Prasad, Ramit" <ramit=2E=
prasad@jpmorgan=2Ecom> wrote:=0D=0A> >Thomas Bach wrote:=3D0D=3D0A> Hi ther=
e,=3D0D=3D0A> =3D0D=3D0A> On Sat, Oct 06, 2012 at =3D=0D=0A> >03:08:38PM +0=
000, Steven D'Aprano wrote:=3D0D=3D0A> >=3D0D=3D0A> > my_tuple =3D3D my_=3D=
=0D=0A> >tuple[:4]=3D0D=3D0A> > a,b,c,d =3D3D my_tuple if len(my_tuple) =3D=
3D=3D3D 4 else (my_=3D=0D=0A> >tuple + (None,)*4)[:4]=3D0D=3D0A> >=3D0D=3D0=
A> =3D0D=3D0A> Are you sure this works as y=3D=0D=0A> >ou expect? I just st=
umbled over the following:=3D0D=3D0A> =3D0D=3D0A> $ python=3D0D=3D=0D=0A> >=
=3D0A> Python 3=3D2E2=3D2E3 (default, Jun 25 2012, 23:10:56)=3D0D=3D0A> [GC=
C 4=3D2E7=3D2E=3D=0D=0A> >1] on linux2=3D0D=3D0A> Type "help", "copyright",=
 "credits" or "license" for mo=3D=0D=0A> >re information=3D2E=3D0D=3D0A> >>=
> split =3D3D ['foo', 'bar']=3D0D=3D0A> >>> head, tail=3D=0D=0A> >=3D3D spl=
it if len(split) =3D3D=3D3D 2 else split[0], None=3D0D=3D0A> >>> head=3D0D=
=3D0A=3D=0D=0A> >> ['foo', 'bar']=3D0D=3D0A> >>> tail=3D0D=3D0A> >>>=3D0D=
=3D0A> =3D0D=3D0A> I don't get it! =3D=0D=0A> >Could someone help me, pleas=
e? Why is head not 'foo'=3D0D=3D0A> and tail not 'b=3D=0D=0A> >ar'?=3D0D=3D=
0A> =3D0D=3D0A> Regards,=3D0D=3D0A> 	Thomas=3D0D=3D0A> --=3D0D=3D0A=3D0D=3D=
0AI think yo=3D=0D=0A> >u just need to wrap the else in parenthesis so the=
=3D0D=3D0Aelse clause is trea=3D=0D=0A> >ted as a tuple=3D2E Without the pa=
renthesis =3D0D=3D0AI believe it is grouping th=3D=0D=0A> >e code like this=
=3D2E=3D0D=3D0A=3D0D=3D0Ahead, tail =3D3D (split if len(split) =3D3D=3D3D 2=
=3D=0D=0A> >else split[0] ), None=3D0D=3D0A=3D0D=3D0AYou want:=3D0D=3D0Ahea=
d, tail =3D3D split if le=3D=0D=0A> >n(split) =3D3D=3D3D 2 else (split[0], =
None )=3D0D=3D0A=3D0D=3D0A=3D0D=3D0ARamit=3D0D=3D0AThis e=3D=0D=0A> >mail i=
s confidential and subject to important disclaimers and=3D0D=3D0Aconditio=
=3D=0D=0A> >ns including on offers for the purchase or sale of=3D0D=3D0Asec=
urities, accurac=3D=0D=0A> >y and completeness of information, viruses,=3D0=
D=3D0Aconfidentiality, legal pri=3D=0D=0A> >vilege, and legal entity discla=
imers,=3D0D=3D0Aavailable at http://www=3D2Ejpmorg=3D=0D=0A> >an=3D2Ecom/pa=
ges/disclosures/email=3D2E=0D=0A> =0D=0A> How does one unpack this post?  ;=
-)=0D=0A> --=0D=0A=0D=0AHmm, I am not sure why that happened=2E For referen=
ce: =0D=0Ahttp://mail=2Epython=2Eorg/pipermail/python-list/2012-October/632=
603=2Ehtml=0D=0AThis email is confidential and subject to important disclai=
mers and=0D=0Aconditions including on offers for the purchase or sale of=0D=
=0Asecurities, accuracy and completeness of information, viruses,=0D=0Aconf=
identiality, legal privilege, and legal entity disclaimers,=0D=0Aavailable =
at http://www=2Ejpmorgan=2Ecom/pages/disclosures/email=2E