Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed4.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 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'heavily': 0.04; 'overflow': 0.09; 'received:internal': 0.09; 'subject:while': 0.09; 'python': 0.11; 'suggest': 0.14; 'aggressively': 0.16; 'haskell,': 0.16; 'imo,': 0.16; 'message- id:@webmail.messagingengine.com': 0.16; 'received:10.202': 0.16; 'received:10.202.2': 0.16; 'received:66.111': 0.16; 'received:66.111.4': 0.16; 'received:messagingengine.com': 0.16; 'subject:recursion': 0.16; 'essential': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'stack': 0.19; 'input': 0.22; 'programming': 0.22; 'error': 0.23; 'header:In-Reply-To:1': 0.27; 'code': 0.31; "d'aprano": 0.31; 'steven': 0.31; 'trivial': 0.31; 'received:66': 0.35; 'but': 0.35; 'surely': 0.36; 'received:10': 0.37; 'to:addr :python-list': 0.38; 'functional': 0.39; 'to:addr:python.org': 0.39; 'from:no real name:2**0': 0.61; 'header:Message-Id:1': 0.63; 'size.': 0.65; 'optimized.': 0.84; '2013,': 0.91 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=fastmail.us; h= message-id:from:to:mime-version:content-transfer-encoding :content-type:in-reply-to:references:subject:date; s=mesmtp; bh= bHtyXJHNsXQD/9yTejKHJJGuhMo=; b=dGVncLAn71uEwk2XbCHQg7EbC/m30XM3 Y4Ymnc9JRFyBoEcKTPefVpO4xYWShUdid9+dWdZBpxjpVDd0qoBPHJtJ7fK4nEe6 /NHfjNeZQikF9CbOjI4h+VHfs/9E4Fmxycr7pd/5vXUlcqoIdBCBCJuGOJ45qmgO LBW00AUvBJY= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=message-id:from:to:mime-version :content-transfer-encoding:content-type:in-reply-to:references :subject:date; s=smtpout; bh=bHtyXJHNsXQD/9yTejKHJJGuhMo=; b=Gao fIYBoNxbJIvbpTHpLq0dmTDE3W3l0IvAfBxDyMj3zeOcTfgLGTJagrq279tiXZRo nYKbBlD6vMmwXMuobNqDj0k9NUyY7B8ehZstC8JpbpuDDpZCqG9UaIuUpOeMDgmt 6D5sW+V4LwDFbOHEPzL0LI55hCCH3r/1R6WphCUc= X-Sasl-Enc: 1rme7OQGbjOabf41DCknQkV2DLIqwzUEhC677QkF0ToY 1380722689 From: random832@fastmail.us To: python-list@python.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain X-Mailer: MessagingEngine.com Webmail Interface - ajax-ce174988 In-Reply-To: <524c206d$0$29984$c3e8da3$5496439d@news.astraweb.com> References: <524c206d$0$29984$c3e8da3$5496439d@news.astraweb.com> Subject: Re: Tail recursion to while iteration in 2 easy steps Date: Wed, 02 Oct 2013 10:04:49 -0400 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: 10 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1380722698 news.xs4all.nl 16008 [2001:888:2000:d::a6]:49744 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:55344 On Wed, Oct 2, 2013, at 9:32, Steven D'Aprano wrote: > Python is not as aggressively functional as (say) Haskell, but it is > surely an exaggeration to suggest that the failure to include tail call > optimization means that Python "rejects" functional programming styles. > You can still write you code in a functional style, it just won't be as > heavily optimized. IMO, tail call optimization is essential to writing in a functional style, since otherwise you end up with a stack overflow error on any input above a trivial size.