Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!cs.uu.nl!news.stack.nl!newsfeed.xs4all.nl!newsfeed1.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: 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; 'python,': 0.02; 'guido': 0.05; 'framework.': 0.07; 'mouse': 0.07; 'tkinter': 0.07; 'assumed': 0.09; 'currently,': 0.09; 'frameworks.': 0.09; 'handlers': 0.09; 'loop.': 0.09; 'non-blocking': 0.09; 'pep': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:2.7': 0.09; 'tcl': 0.09; 'terry': 0.09; 'url:peps': 0.09; 'gui': 0.11; 'adapter': 0.16; 'async': 0.16; 'asyncore': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'reedy': 0.16; 'subject:Second': 0.16; 'subject:Tkinter': 0.16; 'subject:non': 0.16; 'subprocess': 0.16; 'walzer': 0.16; 'wrote:': 0.17; 'module,': 0.17; 'prototype': 0.17; 'url:dev': 0.17; 'widget': 0.17; 'jan': 0.18; '(or': 0.18; 'question.': 0.20; 'pipe': 0.22; 'posted': 0.22; 'kevin': 0.23; 'header:In-Reply- To:1': 0.25; 'header:User-Agent:1': 0.26; 'am,': 0.27; 'question': 0.27; 'i.e.': 0.27; 'module.': 0.27; 'header:X-Complaints-To:1': 0.28; 'maybe': 0.29; 'implement': 0.32; 'url:python': 0.32; 'not.': 0.32; 'anyone': 0.33; 'to:addr:python-list': 0.33; 'text': 0.34; 'along': 0.35; 'process,': 0.35; 'replaced': 0.35; 'so,': 0.35; 'there': 0.35; 'add': 0.36; 'received:org': 0.36; 'really': 0.36; 'but': 0.36; 'url:org': 0.36; 'test': 0.36; 'should': 0.36; 'does': 0.37; 'being': 0.37; 'quite': 0.37; 'data': 0.37; 'subject:: ': 0.38; 'supports': 0.38; 'to:addr:python.org': 0.39; 'easily': 0.39; 'subject:-': 0.40; 'header:Received:5': 0.40; 'help': 0.40; 'think': 0.40; 'side': 0.61; 'skip:n 10': 0.63; 'box.': 0.65; 'want,': 0.65; 'manner': 0.74; 'received:fios.verizon.net': 0.84; 'subject:try': 0.84 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Terry Reedy Subject: Re: Second try: non-blocking subprocess pipe and Tkinter in 2.7 Date: Fri, 21 Dec 2012 22:00:19 -0500 References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: pool-173-75-251-66.phlapa.fios.verizon.net User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/17.0 Thunderbird/17.0 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 32 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1356145244 news.xs4all.nl 6961 [2001:888:2000:d::a6]:46158 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:35334 On 12/21/2012 10:52 AM, Kevin Walzer wrote: > Yesterday I posted a question about keeping a Tkinter GUI during a > long-running process, i.e. reading data from a pipe via the subprocess > module. I think that question did not quite get at the heart of the > issue because it assumed that Python, like Tcl which underlies Tkinter, > supports non-blocking, asynchronous reading out of the box. Apparently > it does not. There is currently the asyncore module, but I don't know that anyone really likes it. > So, my question is hereby revised as such: how can I implement a > non-blocking read of a subprocess pipe that can write data to the > Tkinter text widget in an manner that does not cause the GUI to lock up? Interesting question. Guido is currently, with help from many others with async experience, working on a replacement for asyncore. PEP 3156 - Asynchronous IO Support Rebooted http://python.org/dev/peps/pep-3156/ You can read the pep if you want, but it includes a generalized event loop interface. The prototype (partial) implementation includes (or will) a default event loop. However, the intention is that it can be replaced by (or maybe work with) adapters for existing event loops, including that of gui frameworks. Being able write a tk loop adapter and easily add io events and handlers to work along side with tk key and mouse events and write to a widjet should be an interesting test of the new framework. -- Terry Jan Reedy