Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #82546

Re: Python console rejects an object reference, having made an object with that reference as its name in previous line

Path csiph.com!usenet.pasdenom.info!news.franciliens.net!fdn.fr!usenet-fr.net!nerim.net!novso.com!newsfeed.xs4all.nl!newsfeed2a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <torriem+gmail@torriefamily.org>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.001
X-Spam-Evidence '*H*': 1.00; '*S*': 0.00; 'syntax': 0.04; 'subject:Python': 0.06; 'imported': 0.09; 'interpreted': 0.09; 'lawrence': 0.09; 'measure': 0.09; 'spaces': 0.09; 'works.': 0.09; 'python': 0.11; '"from': 0.16; '__future__': 0.16; 'bracket': 0.16; 'from:addr:torriem': 0.16; 'from:name:michael torrie': 0.16; 'optional': 0.16; 'redundant': 0.16; 'statement.': 0.16; 'subject: \n ': 0.16; 'subject:object': 0.16; 'whitespace.': 0.16; 'wrote:': 0.18; 'import': 0.22; 'saying': 0.22; 'print': 0.22; 'header:User- Agent:1': 0.23; 'error': 0.23; "haven't": 0.24; 'gets': 0.27; 'header:In-Reply-To:1': 0.27; 'function': 0.29; 'thus': 0.29; 'subject:that': 0.31; 'subject:with': 0.35; 'but': 0.35; 'add': 0.35; "didn't": 0.36; 'message-id:@gmail.com': 0.38; 'same.': 0.38; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'space': 0.40; 'expression': 0.60; "you're": 0.61; 'between': 0.67; 'hand': 0.80; 'future,': 0.83; 'subject:made': 0.84; 'treats': 0.84
X-Virus-Scanned amavisd-new at torriefamily.org
Date Sun, 14 Dec 2014 22:27:05 -0700
From Michael Torrie <torriem@gmail.com>
User-Agent Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131118 Thunderbird/17.0.11
MIME-Version 1.0
To python-list@python.org
Subject Re: Python console rejects an object reference, having made an object with that reference as its name in previous line
References <01937423-e700-4825-a502-568dcb2d5324@googlegroups.com> <41c32aed-315a-43df-9dc6-380d0ecc3425@googlegroups.com> <548e4837$0$13012$c3e8da3$5496439d@news.astraweb.com> <m6li43$spf$1@ger.gmane.org>
In-Reply-To <m6li43$spf$1@ger.gmane.org>
Content-Type text/plain; charset=ISO-8859-1
Content-Transfer-Encoding 7bit
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
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.16969.1418621243.18130.python-list@python.org> (permalink)
Lines 22
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1418621243 news.xs4all.nl 2885 [2001:888:2000:d::a6]:33007
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:82546

Show key headers only | View raw

On 12/14/2014 07:47 PM, Mark Lawrence wrote:
> I didn't realise that Python was so smart.  It can indicate a syntax 
> error at the final 't' in print before it gets to the opening bracket 
> that is required for the print function in Python 3 (and Python 2 if 
> you're using "from __future__ import print_function")?

Not really.  Python2 just interprets "print (value)" as an expression to
the print statement.  It's like saying "a=(value)" and then "print a".
Redundant but works.  However "print(value)" is interpreted as a
function call, and if you haven't imported it from future, it will error
out on Python2.

Python 3, on the other hand treats spaces between a function and its
opening paren to be optional whitespace.  Thus to python3,
"print(value)" and "print (value)" are the same.

So if you always put a space between print and (value) you can achieve
some measure of cross-version compatibility with print.  However by
including print_function from __future__ you are guaranteeing you won't
forget to add the parens.

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Python console rejects an object reference, having made an object with that reference as its name in previous line Simon Evans <musicalhacksaw@yahoo.co.uk> - 2014-12-14 08:15 -0800
  Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Ned Batchelder <ned@nedbatchelder.com> - 2014-12-14 11:36 -0500
  Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Simon Evans <musicalhacksaw@yahoo.co.uk> - 2014-12-14 10:37 -0800
    Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-12-14 20:51 +0200
  Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Billy Earney <billy.earney@gmail.com> - 2014-12-14 10:43 -0600
  Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Simon Evans <musicalhacksaw@yahoo.co.uk> - 2014-12-14 15:21 -0800
    Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-15 11:36 +1100
    Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Chris Roy-Smith <chris_roysmith@internode.on.net> - 2014-12-15 13:32 +1100
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Chris Angelico <rosuav@gmail.com> - 2014-12-15 13:42 +1100
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-12-15 02:47 +0000
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Michael Torrie <torriem@gmail.com> - 2014-12-14 22:27 -0700
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Chris Angelico <rosuav@gmail.com> - 2014-12-15 16:32 +1100
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Michael Torrie <torriem@gmail.com> - 2014-12-14 22:38 -0700
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-12-14 23:51 -0600
      Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Chris Angelico <rosuav@gmail.com> - 2014-12-15 16:52 +1100
  Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Simon Evans <musicalhacksaw@yahoo.co.uk> - 2014-12-18 08:19 -0800
    Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Michael Torrie <torriem@gmail.com> - 2014-12-18 09:35 -0700
  Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Simon Evans <musicalhacksaw@yahoo.co.uk> - 2015-01-04 04:49 -0800
    Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-04 13:11 +0000
    Re: Python console rejects an object reference, having made an object with that reference as its name in previous line Dave Angel <davea@davea.name> - 2015-01-04 09:14 -0500

csiph-web