Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.85.MISMATCH!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <ian.g.kelly@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.009
X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'explicitly': 0.04; 'newbie': 0.05; 'interpreted': 0.07; 'python': 0.09; '22,': 0.09; 'looked': 0.10; 'big,': 0.16; 'closures': 0.16; 'confusion': 0.16; 'ideally,': 0.16; 'keyword.': 0.16; 'oct': 0.16; 'trap': 0.16; 'works"': 0.16; 'mon,': 0.16; 'wrote:': 0.17; 'odd': 0.17; 'variables': 0.17; 'variable': 0.20; 'sort': 0.21; 'either.': 0.22; "python's": 0.23; "i've": 0.23; 'header:In-Reply-To:1': 0.25; 'am,': 0.27; 'possibly': 0.27; 'message-id:@mail.gmail.com': 0.27; "doesn't": 0.28; 'chris': 0.28; 'declared': 0.29; 'code': 0.31; 'could': 0.32; 'limitations': 0.33; 'to:addr:python-list': 0.33; 'another': 0.33; 'received:google.com': 0.34; 'done': 0.34; 'received:209.85': 0.35; 'but': 0.36; 'received:209': 0.37; 'subject:: ': 0.38; 'there,': 0.38; 'to:addr:python.org': 0.39; 'subject:-': 0.40; 'header:Received:5': 0.40; 'most': 0.61; 'time,': 0.62; 'between': 0.63; 'more': 0.63; 'levels': 0.66; 'introduce': 0.80; '"just': 0.84; 'enforced': 0.84; 'fat': 0.84; 'locals': 0.84; 'to:name:python': 0.84; 'shadow': 0.91
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=TITUoDR2FyETxhNAKVrJZgfZOc5dEsKItJ4LdrD+IMk=; b=viCv29o18G1NhtKeFmZeSVukBfcgy4eUzofdr3nSs8kXvXyCEFaB1fShNVAugdwNVf UvLFxjxpzkwMtmDAft22Ry/icOHoiuOFM/hUQXcTqZ6SCxMGBHApFl4F1BA/9+FmHqgz PsM+vbfsERe+cjvppuHo0CVeKgAKbOTnjGJj3wDyEHEpPkagoVpnFPuYyDMmx0++cSqs O5ZlE/ZDwhBHdlovArehAY8TZDkpuSpvsm2Vi3k2KlUFQuIVnSydnYU6RWyR8RFg535M 73ztP0uYLiyuGC8BWi6bK08RKf6w9zdUXNaRkHRwVx/EmNKMyZfrUIh0BvzinBWOnPdK d2YQ==
MIME-Version: 1.0
In-Reply-To: <CAPTjJmphN0LEK9j+gMizZFtkcyB5S9LSdSZgQSmbxG4C1cXnsw@mail.gmail.com>
References: <mailman.2501.1350638446.27098.python-list@python.org> <5081d0c3$0$30003$c3e8da3$5496439d@news.astraweb.com> <mailman.2543.1350692652.27098.python-list@python.org> <k5ubs7$p6b$1@reader1.panix.com> <5083ad3e$0$29978$c3e8da3$5496439d@news.astraweb.com> <mailman.2582.1350811250.27098.python-list@python.org> <5083c7da$0$29978$c3e8da3$5496439d@news.astraweb.com> <mailman.2588.1350819797.27098.python-list@python.org> <508448c6$0$29978$c3e8da3$5496439d@news.astraweb.com> <mailman.2601.1350850942.27098.python-list@python.org> <5084e819$0$29897$c3e8da3$5496439d@news.astraweb.com> <CAPTjJmphN0LEK9j+gMizZFtkcyB5S9LSdSZgQSmbxG4C1cXnsw@mail.gmail.com>
From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Mon, 22 Oct 2012 16:02:34 -0600
Subject: Re: A desperate lunge for on-topic-ness
To: Python <python-list@python.org>
Content-Type: text/plain; charset=ISO-8859-1
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: <http://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: <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.2639.1350943387.27098.python-list@python.org>
Lines: 17
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1350943387 news.xs4all.nl 6865 [2001:888:2000:d::a6]:58753
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:31906

On Mon, Oct 22, 2012 at 1:03 AM, Chris Angelico <rosuav@gmail.com> wrote:
> Python's system "just works" most of
> the time, but can introduce yet another trap for the unsuspecting
> newbie who doesn't understand the difference between rebinding and
> mutating; I've not looked into multiple levels of closures but I
> suspect there'll be odd limitations there, as there's only one
> "nonlocal" keyword.

On my wishlist for Python is a big, fat SyntaxError for any variable
that could be interpreted as either local or nonlocal and is not
explicitly declared as either.  It would eliminate this sort of
confusion entirely and make code that shadows nonlocal variables much
more readable.

Ideally, the same thing would also be done for locals that shadow
globals, but I don't see how that could possibly be enforced at
compile time.