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

Groups > comp.lang.python > #93682

Re: 0 + not 0

Path csiph.com!optima2.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed7.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <rosuav@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.007
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'operator': 0.03; 'subject: + ': 0.07; 'cc:addr:python-list': 0.09; 'minus': 0.09; 'precedence': 0.09; 'subject:not': 0.11; 'syntax': 0.13; "'+'": 0.16; 'footnote': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'unary': 0.16; 'wrote:': 0.16; 'case.': 0.18; 'instance,': 0.18; '2015': 0.20; 'cc:2**0': 0.20; 'cc:addr:python.org': 0.20; 'referring': 0.22; 'code,': 0.23; 'sat,': 0.23; 'header:In-Reply-To:1': 0.24; "doesn't": 0.26; 'message-id:@mail.gmail.com': 0.27; 'raise': 0.29; 'error.': 0.31; "can't": 0.32; 'source': 0.33; 'list': 0.34; 'received:google.com': 0.35; 'but': 0.36; 'there': 0.36; 'pm,': 0.36; 'subject:: ': 0.37; 'does': 0.39; "you'll": 0.61; 'details': 0.62; 'better.': 0.66; 'jul': 0.72; 'special': 0.73; "'not'": 0.84; 'chrisa': 0.84; 'samedi': 0.84; 'to:none': 0.91
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type:content-transfer-encoding; bh=y1M5sxumraNXInRMLRcwHbjwX4Kl25GlItq8lE1gKhs=; b=aS6m/XiDAmm2pEHb/nto7mKhHIF+UKySBzSVNJUlI1XJQ7arYdZuwjqgEIx28t2Z6w tii/JuN9zoL8y6B6+B3CCzX1OLsGvTSxVw77rlnGNYyT3ic0ek5Ptr1/9Xn+Nz5QU1qL FoVLvxUqBLA3AuqK0dpvjr4qJpGVBCHpN7Gx84jQoh3u62pYIc8hLJvBCip6hjq7PJxM lToQQzWcZsaUr7QZmm9UcO2KYCQVCKHHZ3E4y1whGAnHm/QY4lA3tXAEZNsz4PQWZ69Q yImVbMo1kFC+6DevO6iNg20tD43XzJ7Mq1erNmTlMqZ8GjxSrUAZ74Ve2EK8zwAk0FeA +81w==
MIME-Version 1.0
X-Received by 10.50.7.104 with SMTP id i8mr3422760iga.50.1436616304064; Sat, 11 Jul 2015 05:05:04 -0700 (PDT)
In-Reply-To <57a9e100-5783-4d95-bb41-f1d19e757c16@googlegroups.com>
References <01ec6551-1f40-42b0-9406-036030591519@googlegroups.com> <55a0f241$0$2933$e4fe514c@news2.news.xs4all.nl> <55a0fa36$0$2935$e4fe514c@news.xs4all.nl> <mailman.417.1436613616.3674.python-list@python.org> <55a0fe55$0$2875$e4fe514c@news.xs4all.nl> <57a9e100-5783-4d95-bb41-f1d19e757c16@googlegroups.com>
Date Sat, 11 Jul 2015 22:05:03 +1000
Subject Re: 0 + not 0
From Chris Angelico <rosuav@gmail.com>
Cc "python-list@python.org" <python-list@python.org>
Content-Type text/plain; charset=UTF-8
Content-Transfer-Encoding quoted-printable
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.20+
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.419.1436616312.3674.python-list@python.org> (permalink)
Lines 20
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1436616312 news.xs4all.nl 2834 [2001:888:2000:d::a6]:40706
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:93682

Show key headers only | View raw

On Sat, Jul 11, 2015 at 9:54 PM, candide <c.candide@laposte.net> wrote:
> Le samedi 11 juillet 2015 13:31:03 UTC+2, Luuk a écrit :
>
>>
>> But operator precedence of 'not' is higher than of '+' ????
>
>
> Right but what does this prove? For instance, unary minus has higher precedence than exponentiation but the expression
>
> 2 ** -1
>
> doesn't raise a syntax error.

You'll see down below a footnote referring to this as a special case.
But I don't know the details of how it all works, so short of digging
into the source code, I can't explain this any better. There are
others on this list who can, I believe.

ChrisA

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

Thread

0 + not 0 candide <c.candide@laposte.net> - 2015-07-11 03:26 -0700
  Re: 0 + not 0 Chris Angelico <rosuav@gmail.com> - 2015-07-11 20:38 +1000
  Re: 0 + not 0 Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2015-07-11 12:38 +0200
    Re: 0 + not 0 Luuk <luuk@invalid.lan> - 2015-07-11 13:12 +0200
      Re: 0 + not 0 Chris Angelico <rosuav@gmail.com> - 2015-07-11 21:20 +1000
        Re: 0 + not 0 Luuk <luuk@invalid.lan> - 2015-07-11 13:30 +0200
          Re: 0 + not 0 candide <c.candide@laposte.net> - 2015-07-11 04:54 -0700
            Re: 0 + not 0 Chris Angelico <rosuav@gmail.com> - 2015-07-11 22:05 +1000
              Re: 0 + not 0 candide <c.candide@laposte.net> - 2015-07-11 06:22 -0700
        Re: 0 + not 0 candide <c.candide@laposte.net> - 2015-07-11 04:48 -0700
      Re: 0 + not 0 random832@fastmail.us - 2015-07-11 16:46 -0400
  Re: 0 + not 0 Serhiy Storchaka <storchaka@gmail.com> - 2015-07-11 16:38 +0300
    Re: 0 + not 0 candide <c.candide@laposte.net> - 2015-07-11 08:07 -0700
    Re: 0 + not 0 MRAB <python@mrabarnett.plus.com> - 2015-07-11 17:20 +0100
    Re: 0 + not 0 Ian Kelly <ian.g.kelly@gmail.com> - 2015-07-11 10:56 -0600
      Re: 0 + not 0 Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-07-12 18:12 +1200
    Re: 0 + not 0 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-11 21:05 +0100

csiph-web