Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Date: Wed, 25 Jul 2012 12:30:01 +0200
From: Philipp Hagemeister <phihag@phihag.de>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.5) Gecko/20120624 Icedove/10.0.5
MIME-Version: 1.0
To: Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com>
Subject: Re: from future import pass_function
References: <d1o4e9-tlr.ln1@satorlaser.homedns.org>
In-Reply-To: <d1o4e9-tlr.ln1@satorlaser.homedns.org>
OpenPGP: id=FAFB085C
Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="------------enig6983CCBE770F084AB02ECEF3"
Cc: python-list@python.org
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.2565.1343212216.4697.python-list@python.org>
Lines: 76
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:26031

This is an OpenPGP/MIME signed message (RFC 2440 and 3156)
--------------enig6983CCBE770F084AB02ECEF3
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

Unlike the print statement, pass has no overboarding complexity (like
>>, printing tuples, etc.) - it just serves as a marker (and
practicality beats purity).

And you don't ever want to use pass as a value (say, for map() or the
right side of an assignment). In fact, if pass were a function, users
could construct strange code like

x =3D pass()

def pass():
   raise Exception('Are you slacking off? Get back to work!')

And don't forget that while the parentheses mainly confuse users,
they're also making it harder to type, and feel like useless overhead
(similar to the parentheses in  if (x):  ). In fact, I'd argue that if
pass were a function, None would be the better placeholder:

try:
    do_something()
except:
    None # 2 hard-to-type (on a German keyboard) characters shorter
    # (and probably way faster: No function call overhead and no need
    #  to actually find out what pass happens to be in this context)

- Philipp


On 07/25/2012 10:40 AM, Ulrich Eckhardt wrote:
> Hi!
>
> I just had an idea, it occurred to me that the pass statement is pretty=

> similar to the print statement, and similarly to the print() function,
> there could be a pass() function that does and returns nothing.
>
> Example:
>    def pass():
>        return
>
>    try:
>        do_something()
>    except:
>        pass()
>
>
> One thing I don't like about this is the syntax
>
>    class foo(object):
>        pass()
>
>
> What do you think?
>
> Uli


--------------enig6983CCBE770F084AB02ECEF3
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (GNU/Linux)

iEYEAREKAAYFAlAPyqsACgkQ9eq1gvr7CFwG0QCfdbVu/D7WxmsB8VwFVcrscpdq
cIwAn3WreGWR34zsYaBd6sFmUANg/PUQ
=LwyH
-----END PGP SIGNATURE-----

--------------enig6983CCBE770F084AB02ECEF3--