Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #87700
| Path | csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail |
|---|---|
| Return-Path | <python.list@tim.thechases.com> |
| X-Original-To | python-list@python.org |
| Delivered-To | python-list@mail.python.org |
| X-Spam-Status | OK 0.000 |
| X-Spam-Evidence | '*H*': 1.00; '*S*': 0.00; 'syntax': 0.04; '"""': 0.07; 'abuse': 0.07; 'ignored': 0.07; 'nicely': 0.07; 'string': 0.09; '"r"': 0.09; 'escape': 0.09; 'mess': 0.09; 'mixed': 0.09; 'otherwise)': 0.09; 'strings.': 0.09; 'subject:Why': 0.09; 'translate': 0.10; 'cc:addr:python-list': 0.11; 'python': 0.11; 'def': 0.12; '"test"': 0.16; '-tkc': 0.16; 'a():': 0.16; 'backslash': 0.16; 'backslashes': 0.16; 'bhatt': 0.16; 'discarded.': 0.16; 'expected,': 0.16; 'from:addr:python.list': 0.16; 'from:addr:tim.thechases.com': 0.16; 'from:name:tim chase': 0.16; 'string:': 0.16; 'subject: \n ': 0.16; 'subject:comment': 0.16; 'subject:quoted': 0.16; 'subject:simple': 0.16; 'subject:triple': 0.16; 'wrote:': 0.18; '(where': 0.19; '>>>': 0.22; 'appears': 0.22; 'import': 0.22; 'cc:addr:python.org': 0.22; 'print': 0.22; 'error': 0.23; "aren't": 0.24; 'string,': 0.24; 'tells': 0.24; 'cc:2**0': 0.24; 'cc:no real name:2**0': 0.24; 'sort': 0.25; 'least': 0.26; 'header:In-Reply-To:1': 0.27; 'gives': 0.31; 'comments': 0.31; 'comments,': 0.31; 'multiline': 0.31; 'quotes': 0.31; 'allows': 0.31; 'regular': 0.32; 'beginning': 0.33; 'raw': 0.33; '(2)': 0.35; 'test': 0.35; 'but': 0.35; 'there': 0.35; 'charset:us-ascii': 0.36; 'subject:?': 0.36; 'received:10': 0.37; 'enough': 0.39; 'tell': 0.60; 'issues,': 0.61; 'provide': 0.64; 'to:addr:gmail.com': 0.65; 'subject:. ': 0.67; 'line,': 0.68; 'results': 0.69; "'true'": 0.84; 'actually,': 0.84; 'magical': 0.91 |
| X-Sender-Id | wwwh|x-authuser|tim@thechases.com |
| X-Sender-Id | wwwh|x-authuser|tim@thechases.com |
| X-MC-Relay | Neutral |
| X-MailChannels-SenderId | wwwh|x-authuser|tim@thechases.com |
| X-MailChannels-Auth-Id | wwwh |
| X-MC-Loop-Signature | 1426702455020:107552668 |
| X-MC-Ingress-Time | 1426702455020 |
| Date | Wed, 18 Mar 2015 13:15:28 -0500 |
| From | Tim Chase <python.list@tim.thechases.com> |
| To | Aditya Raj Bhatt <adityarajbhatt@gmail.com> |
| Cc | python-list@python.org |
| Subject | Re: A simple single line, triple-quoted comment is giving syntax error. Why? |
| In-Reply-To | <f7b84d9d-c559-4711-ad63-1deea5f12c62@googlegroups.com> |
| References | <f7b84d9d-c559-4711-ad63-1deea5f12c62@googlegroups.com> |
| X-Mailer | Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu) |
| Mime-Version | 1.0 |
| Content-Type | text/plain; charset=US-ASCII |
| Content-Transfer-Encoding | 7bit |
| X-AuthUser | tim@thechases.com |
| X-BeenThere | python-list@python.org |
| X-Mailman-Version | 2.1.19 |
| Precedence | list |
| List-Id | General discussion list for the Python programming language <python-list.python.org> |
| List-Unsubscribe | <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe> |
| List-Archive | <http://mail.python.org/pipermail/python-list/> |
| List-Post | <mailto:python-list@python.org> |
| List-Help | <mailto:python-list-request@python.org?subject=help> |
| List-Subscribe | <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.8.1426710961.10327.python-list@python.org> (permalink) |
| Lines | 74 |
| NNTP-Posting-Host | 2001:888:2000:d::a6 |
| X-Trace | 1426710961 news.xs4all.nl 2889 [2001:888:2000:d::a6]:44602 |
| X-Complaints-To | abuse@xs4all.nl |
| Xref | csiph.com comp.lang.python:87700 |
Show key headers only | View raw
On 2015-03-18 10:46, Aditya Raj Bhatt wrote:
> a = 5 '''a comment'''
>
> results in a syntax error
That's to be expected, and happens with any string, not just
triple-quoted:
>>> a = 5 "hello"
> there are no 'true' multiline comments in python and that all those
> 'block' comments are actually triple-quoted strings.
Yes, that's an abuse of strings. It works nicely for doc-strings,
but I avoid it for everything else.
> So can someone tell me why a triple-quoted string gives a syntax
> error if only in one line?
When a string (triple-quoted or otherwise) begins at the beginning of
a line, its return value is ignored at compile-time:
>>> def a():
... print 1
... "test"
... print 2
...
>>> import dis
>>> dis.dis(a)
2 0 LOAD_CONST 1 (1)
3 PRINT_ITEM
4 PRINT_NEWLINE
4 5 LOAD_CONST 2 (2)
8 PRINT_ITEM
9 PRINT_NEWLINE
10 LOAD_CONST 0 (None)
13 RETURN_VALUE
Note that nothing appears in the byte-code for line #3. They Python
interpreter/compiler is smart enough to know that the string can be
discarded.
> Actually, there are other confusions I have too, regarding using
> backslashes inside triple-quoted strings to form multi-line
> comments, and a general uncertainty about triple-quoted strings.
>
> Can someone also provide a sort of a 'guide' to triple-quoted
> comments in general?
Triple-quoted strings aren't particularly magical other than that
they allow you to have multi-line strings and it allows you to have
both single and double quotes inside the string with less mess than
if you have them mixed in a regular string (where you'd need to
escape at least one of them).
s1 = "Single ' and double \" quotes"
s2 = 'Single \' and double " quotes'
s3 = """Single ' and double " quotes"""
If you want to avoid some of the backslash issues, you can make it a
raw triple-quoted string:
s = r"""this is in
c:\temp\new>
for you to test
"""
Note the leading "r" before the quotes. This is what tells Python
not to translate the "\t" and "\n" in the following content.
-tkc
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
A simple single line, triple-quoted comment is giving syntax error. Why? Aditya Raj Bhatt <adityarajbhatt@gmail.com> - 2015-03-18 10:46 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Laurent Pointal <laurent.pointal@laposte.net> - 2015-03-18 19:04 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Laurent Pointal <laurent.pointal@laposte.net> - 2015-03-18 19:06 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-18 20:53 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-18 20:56 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Terry Reedy <tjreedy@udel.edu> - 2015-03-18 17:47 -0400
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-19 09:58 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-03-19 10:23 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Aditya Raj Bhatt <adityarajbhatt@gmail.com> - 2015-03-18 11:23 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Igor Korot <ikorot01@gmail.com> - 2015-03-18 14:45 -0400
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Laurent Pointal <laurent.pointal@laposte.net> - 2015-03-18 20:08 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Tim Roberts <timr@probo.com> - 2015-03-28 16:34 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-18 21:21 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Tim Chase <python.list@tim.thechases.com> - 2015-03-18 13:15 -0500
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ben Finney <ben+python@benfinney.id.au> - 2015-03-19 11:06 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Denis McMahon <denismfmcmahon@gmail.com> - 2015-03-19 00:53 +0000
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-22 04:14 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-03-22 14:36 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-22 04:49 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-03-22 15:11 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 05:35 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-25 23:09 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 17:45 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 12:29 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 19:54 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 17:27 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-28 19:20 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-29 01:56 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-29 12:41 +0200
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-31 01:23 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? sohcahtoa82@gmail.com - 2015-03-31 16:10 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-04-01 10:36 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-31 17:43 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-04-02 23:31 +0200
Re: A simple single line, triple-quoted comment is giving syntax error. Why? sohcahtoa82@gmail.com - 2015-04-02 15:26 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-02 18:21 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-04-03 16:40 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Chris Angelico <rosuav@gmail.com> - 2015-04-03 16:57 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Marko Rauhamaa <marko@pacujo.net> - 2015-04-03 10:13 +0300
r"\"" ??? (was A simple single line, triple-quoted comment) Rustom Mody <rustompmody@gmail.com> - 2015-04-03 05:52 -0700
Re: r"\"" ??? (was A simple single line, triple-quoted comment) Chris Angelico <rosuav@gmail.com> - 2015-04-04 01:40 +1100
Re: r"\"" ??? (was A simple single line, triple-quoted comment) Rustom Mody <rustompmody@gmail.com> - 2015-04-03 08:14 -0700
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-03 09:25 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-04-03 00:40 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-03-27 11:43 +1300
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-28 19:06 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 12:32 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 19:56 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-03-27 10:15 +1100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Tim Chase <python.list@tim.thechases.com> - 2015-03-26 18:47 -0500
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Ian Kelly <ian.g.kelly@gmail.com> - 2015-03-26 19:38 -0600
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Marko Rauhamaa <marko@pacujo.net> - 2015-03-27 07:34 +0200
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Dave Angel <davea@davea.name> - 2015-03-26 01:23 -0400
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 18:25 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-26 18:30 +0100
Re: A simple single line, triple-quoted comment is giving syntax error. Why? Marko Rauhamaa <marko@pacujo.net> - 2015-03-22 12:00 +0200
csiph-web