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From: "Prasad, Ramit" <ramit.prasad@jpmorgan.com>
To: "python-list@python.org" <python-list@python.org>
Subject: RE: Python is readable
Thread-Topic: Python is readable
Thread-Index: AQHNA5FoI0igWUD8KUmFecuUiL1EB5ZtHn0Q
Date: Fri, 16 Mar 2012 17:01:28 +0000
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> >> I don't understand the reason for $arg1 and $arg2=2E Is there some rea=
son=0D=0A> >> why the code couldn't do this instead?=0D=0A> >>=0D=0A> >>   =
      my(@list1, @list2) =3D @_;=0D=0A> >=0D=0A> > @_ contains references t=
o arrays=2E You can't pass two arrays to a=0D=0A> > function=2E=0D=0A> =0D=
=0A> =0D=0A> Why ever not? That seems like basic functionality to me=2E I c=
an't imagine=0D=0A> any modern language that lacks such a simple feature=2E=
 Even Pascal allows=0D=0A> you to pass arrays as arguments to functions=2E=
=0D=0A> =0D=0A> Is there some design principle that I'm missing that explai=
ns why Perl=0D=0A> lacks this feature?=0D=0A=0D=0A=0D=0AMy understanding is=
 that it assigns each scalar argument until it finds a list=0D=0Ato assign =
and then it assigns everything remaining to the list=2E=0D=0A=0D=0Amy @arr =
=3D ( 'test', 'blah', '1234', 'boop', 'foo', 'bar' );=0D=0Amy @arr2 =3D ( '=
adsf', 'qwerty' );=0D=0Aprint "@arr\n";=0D=0Amy @arr3 =3D (@arr, @arr2);=0D=
=0Aprint "arr3:@arr3\n";=0D=0Amy ($arg1, $arg2, @arg3) =3D @arr3;=0D=0Aprin=
t "arg3:@arg3\n";=0D=0A=0D=0Abash-3=2E2$ perl temp=2Epl=0D=0Atestblah1234bo=
opfoobar=0D=0Aarr3:test blah 1234 boop foo bar adsf qwerty=0D=0Aarg3:1234 b=
oop foo bar adsf qwerty=0D=0A=0D=0A=0D=0AI assume this is because it combin=
es both elements of the list into one =0D=0Agiant list and then if you try =
and assign two lists it does not know=0D=0Awhere to split it=2E Now if you =
pass a reference to the two arrays instead =0D=0Aof the values it should wo=
rk as expected, but now you are dealing with pointers / =0D=0Areferences=2E=
=0D=0A=0D=0A=0D=0Abash-3=2E2$ cat temp=2Epl=0D=0Amy @arr =3D ( 'test', 'bla=
h', '1234', 'boop', 'foo', 'bar' );=0D=0Amy @arr2 =3D ( 'adsf', 'qwerty' );=
=0D=0Aprint "@arr\n";=0D=0Amy @arr3 =3D (\@arr, \@arr2);=0D=0Aprint "arr3:@=
arr3\n";=0D=0Amy ($arg1, $arg2, @arg3) =3D @arr3;=0D=0Aprint "arg1:@$arg1\n=
arg2:@$arg2\narg3:@arg3\n";=0D=0A=0D=0Abash-3=2E2$ perl temp=2Epl=0D=0Atest=
 blah 1234 boop foo bar=0D=0Aarr3:ARRAY(0xb2f0f90) ARRAY(0xb2f1020)=0D=0Aar=
g1:test blah 1234 boop foo bar=0D=0Aarg2:adsf qwerty=0D=0Aarg3:=0D=0A=0D=0A=
=0D=0A=0D=0A=0D=0A=0D=0ARamit=0D=0A=0D=0A=0D=0ARamit Prasad | JPMorgan Chas=
e Investment Bank | Currencies Technology=0D=0A712 Main Street | Houston, T=
X 77002=0D=0Awork phone: 713 - 216 - 5423=0D=0A=0D=0A--=0D=0AThis email is =
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