Path: csiph.com!usenet.pasdenom.info!news.albasani.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!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; 'else:': 0.03; 'elif': 0.04; 'context': 0.05; 'sys': 0.05; 'mode:': 0.07; 'subject:file': 0.07; 'python': 0.09; 'open(file,': 0.09; 'sys.stdout': 0.09; 'termination': 0.09; 'cc:addr:python-list': 0.10; 'def': 0.10; '"-":': 0.16; 'contextlib': 0.16; 'echo': 0.16; 'gamma': 0.16; 'mode)': 0.16; 'subject:object': 0.16; 'to:addr:web.de': 0.16; 'yield': 0.17; 'thanks,': 0.18; 'import': 0.21; 'delta': 0.22; 'cc:2**0': 0.23; 'this:': 0.23; 'cc:no real name:2**0': 0.24; 'cc:addr:python.org': 0.25; 'header:In-Reply-To:1': 0.25; 'skip:@ 10': 0.27; 'message-id:@mail.gmail.com': 0.27; 'cat': 0.29; 'url:mailman': 0.29; 'maybe': 0.29; 'gets': 0.32; 'url:python': 0.32; 'file': 0.32; 'print': 0.32; 'url:listinfo': 0.32; 'handle': 0.33; 'problem': 0.33; 'received:google.com': 0.34; 'false': 0.35; 'sometimes': 0.35; 'subject:?': 0.35; 'received:209.85': 0.35; 'something': 0.35; 'there': 0.35; 'but': 0.36; 'url:org': 0.36; 'closing': 0.36; 'received:209': 0.37; 'subject:: ': 0.38; 'header:Received:5': 0.40; 'url:mail': 0.40; 'otten': 0.84 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=T08u5KvRGjHEjvcagAqeUimgbp8wmlpFvCoSEOQGcI8=; b=JC+2VoNN1lbyaRdGjuSd7eZ7nYd8UbrN8SdWuIOAu/UDxfde/GnZaZFTlJRqvgXO/K KS0W/UBIJZ8Nz6OXBJfrtamuxWyosWzKTbIKhlvu15/Ci4pnSzebfCU2T6tuYRNpUrOl Y8JWDEf+9TTgl3BL78U9iQmbFdbV/uQ+OQ+rH8vDGfoVddN7feTyIdM9dOYTRtB+oG9H foEwYtv4D9p0DGCkVHz+yPTCuEOpqs9vDo3LJv7R9inw4VPWGzg6xPsjJ0/jl5t50H9N G7TrfUKmB4UO7WpIPoyyiaASF2D9nSR34/QlayZ0qjF2MdpZBo42eyaZ1ojr2okoBtfU yGtg== MIME-Version: 1.0 In-Reply-To: References: Date: Mon, 5 Nov 2012 13:16:47 +0000 Subject: Re: accepting file path or file object? From: andrea crotti To: Peter Otten <__peter__@web.de> Content-Type: text/plain; charset=ISO-8859-1 Cc: python-list@python.org 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: 51 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1352121410 news.xs4all.nl 6952 [2001:888:2000:d::a6]:42336 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:32768 2012/11/5 Peter Otten <__peter__@web.de>: > I sometimes do something like this: > > $ cat xopen.py > import re > import sys > from contextlib import contextmanager > > @contextmanager > def xopen(file=None, mode="r"): > if hasattr(file, "read"): > yield file > elif file == "-": > if "w" in mode: > yield sys.stdout > else: > yield sys.stdin > else: > with open(file, mode) as f: > yield f > > def grep(stream, regex): > search = re.compile(regex).search > return any(search(line) for line in stream) > > if len(sys.argv) == 1: > print grep(["alpha", "beta", "gamma"], "gamma") > else: > with xopen(sys.argv[1]) as f: > print grep(f, sys.argv[2]) > $ python xopen.py > True > $ echo 'alpha beta gamma' | python xopen.py - gamma > True > $ echo 'alpha beta gamma' | python xopen.py - delta > False > $ python xopen.py xopen.py context > True > $ python xopen.py xopen.py gamma > True > $ python xopen.py xopen.py delta > False > $ > > > -- > http://mail.python.org/mailman/listinfo/python-list That's nice thanks, there is still the problem of closing the file handle but that's maybe not so important if it gets closed at termination anyway..