Path: csiph.com!usenet.pasdenom.info!news.redatomik.org!newsfeed.xs4all.nl!newsfeed4a.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; 'encoding': 0.05; 'output': 0.05; 'string': 0.09; "(i'd": 0.09; 'absent': 0.09; 'implements': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:characters': 0.09; 'subject:string': 0.09; "'w',": 0.16; '(general': 0.16; 'file-like': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'superfluous': 0.16; 'wrote:': 0.18; 'bit': 0.19; 'solution.': 0.20; 'seems': 0.21; '(in': 0.22; 'header:User-Agent:1': 0.23; 'byte': 0.24; 'of.': 0.24; 'skip:e 30': 0.24; 'unicode': 0.24; 'paul': 0.24; "i've": 0.25; 'header:X -Complaints-To:1': 0.27; 'header:In-Reply-To:1': 0.27; 'minor': 0.31; 'way?': 0.31; 'file': 0.32; 'probably': 0.32; 'cases': 0.33; 'skip:d 20': 0.34; 'subject:from': 0.34; 'could': 0.34; 'problem': 0.35; 'but': 0.35; 'there': 0.35; 'dance': 0.36; 'object,': 0.36; 'to:addr:python-list': 0.38; 'rather': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'easy': 0.60; 'simple': 0.61; 'charset:windows-1252': 0.65; 'approach.': 0.91 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Serhiy Storchaka Subject: Re: Stripping unencodable characters from a string Date: Fri, 08 May 2015 15:28:54 +0300 References: <24ef6c6d-a47a-4d8c-8651-c581e25161cb@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: 193.202.118.166 User-Agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 In-Reply-To: <24ef6c6d-a47a-4d8c-8651-c581e25161cb@googlegroups.com> X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ 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: 24 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1431088153 news.xs4all.nl 2827 [2001:888:2000:d::a6]:43055 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:90158 On 05.05.15 21:19, Paul Moore wrote: > I want to write a string to an already-open file (sys.stdout, typically). However, I *don't* want encoding errors, and the string could be arbitrary Unicode (in theory). The best way I've found is > > data = data.encode(file.encoding, errors='replace').decode(file.encoding) > file.write(data) > > (I'd probably use backslashreplace rather than replace, but that's a minor point). > > Is that the best way? The multiple re-encoding dance seems a bit clumsy, but it was the best I could think of. There are flaws in this approach. 1) file.encoding can be None (StringIO) or absent (general file-like object, that implements only write()). 2) When the encoding is UTF-16, UTF-32, UTF-8-SIG, the output will contain superfluous byte order marks. This is not easy problem and there is no simple solution. In particular cases you can create TextIOWrapper(file.buffer, 'w', encoding=file.encoding, errors='replace', newline=file.newlines, write_through=True) and write to it, but be aware of limitations.