Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: MRAB Newsgroups: comp.lang.python Subject: Re: how to solve memory Date: Sat, 11 Jun 2016 01:33:54 +0100 Lines: 24 Message-ID: References: <4f853aa2-cc00-480b-9fd7-79b05cbd4889@googlegroups.com> <8a1c372e-bd6c-4923-8ae1-8f129ec749e4@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de BLxT9j1Mzo9ZYDy0hUvmNA6DM3WEuFvzb5KTzhsVSPWw== Return-Path: 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; 'list?': 0.07; "'b'": 0.16; 'combinations': 0.16; 'from:addr:mrabarnett.plus.com': 0.16; 'from:addr:python': 0.16; 'from:name:mrab': 0.16; 'message- id:@mrabarnett.plus.com': 0.16; 'received:192.168.1.4': 0.16; 'received:84.93': 0.16; 'received:84.93.230': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'wrote:': 0.16; 'memory': 0.17; 'code,': 0.23; 'header:In-Reply-To:1': 0.24; 'header:User- Agent:1': 0.26; 'correct': 0.28; 'indentation': 0.29; 'received:84': 0.32; 'statement': 0.32; 'items.': 0.33; 'add': 0.34; 'list': 0.34; 'quite': 0.35; 'skip:i 20': 0.36; 'there': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'sure': 0.39; 'received:192': 0.39; 'to:addr:python.org': 0.40; 'where': 0.40; 'still': 0.40; "you'll": 0.61 X-CM-Score: 0.00 X-CNFS-Analysis: v=2.1 cv=bsGxfxui c=1 sm=1 tr=0 a=0nF1XD0wxitMEM03M9B4ZQ==:117 a=0nF1XD0wxitMEM03M9B4ZQ==:17 a=L9H7d07YOLsA:10 a=9cW_t1CCXrUA:10 a=s5jvgZ67dGcA:10 a=IkcTkHD0fZMA:10 a=torLUKblTbsdRXkHehsA:9 a=QEXdDO2ut3YA:10 X-AUTH: mrabarnett@:2500 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.1.1 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: X-Mailman-Original-References: <4f853aa2-cc00-480b-9fd7-79b05cbd4889@googlegroups.com> <8a1c372e-bd6c-4923-8ae1-8f129ec749e4@googlegroups.com> Xref: csiph.com comp.lang.python:109805 On 2016-06-11 00:31, meInvent bbird wrote: > it is quite ridiculous, > this time i am sure that i put correct indentation > and add a else statement to make sure recursive call inside the > if statement , it still memory error, > > where is the memory error? > > is itertools.combinations so big for the list? > [snip] How long is initlist? When I ran the code, it said over 100_000 items. How many combinations would there be? Over 10_000_000_000. That's how long the list 'b' would be. You'll need 10s of gigabytes of memory and a lot of patience!