Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!newsfeed.xs4all.nl!newsfeed6.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 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'f.close()': 0.07; 'filename': 0.07; 'filenames': 0.07; '"w")': 0.09; 'collections': 0.09; 'filenames:': 0.09; 'subject:Function': 0.09; 'extension': 0.13; 'extensions': 0.13; 'class:': 0.16; 'count)': 0.16; 'extensions:': 0.16; 'from:addr:mrabarnett.plus.com': 0.16; 'from:addr:python': 0.16; 'from:name:mrab': 0.16; 'guys,': 0.16; 'message-id:@mrabarnett.plus.com': 0.16; 'received:84.93': 0.16; 'received:84.93.230': 0.16; 'skip:" 70': 0.16; 'wrote:': 0.17; 'module': 0.19; 'skip:" 40': 0.20; 'trying': 0.21; 'import': 0.21; 'this:': 0.23; 'header:In-Reply-To:1': 0.25; 'header:User- Agent:1': 0.26; 'ext': 0.27; 'prints': 0.29; 'received:192.168.1.3': 0.29; "i'm": 0.29; 'function': 0.30; 'code': 0.31; 'file': 0.32; 'etc.)': 0.32; 'received:84': 0.32; 'print': 0.32; 'to:addr:python-list': 0.33; 'path': 0.35; 'list.': 0.35; 'subject:: ': 0.38; 'files': 0.38; 'skip:o 20': 0.38; 'to:addr:python.org': 0.39; 'received:192': 0.39; 'received:192.168': 0.40; 'containing': 0.61; 'times': 0.63; 'header:Reply-To:1': 0.68; 'reply-to:no real name:2**0': 0.72; 'reply-to:addr:python.org': 0.84; 'subject:content': 0.84; 'examine': 0.95 X-CM-Score: 0.00 X-CNFS-Analysis: v=2.0 cv=IekFqBWa c=1 sm=1 a=0nF1XD0wxitMEM03M9B4ZQ==:17 a=lR6CHUT36vYA:10 a=tUWFX44Y8y0A:10 a=ihvODaAuJD4A:10 a=OUOv7kDek9cA:10 a=8nJEP1OIZ-IA:10 a=EBOSESyhAAAA:8 a=8AHkEIZyAAAA:8 a=Sq8MXgxk4qcA:10 a=R2ScKVH5wzZNGDypbRcA:9 a=wPNLvfGTeEIA:10 a=0nF1XD0wxitMEM03M9B4ZQ==:117 X-AUTH: mrabarnett:2500 Date: Thu, 06 Sep 2012 16:20:30 +0100 From: MRAB User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20120824 Thunderbird/15.0 MIME-Version: 1.0 To: python-list@python.org Subject: Re: Function for examine content of directory References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list Reply-To: python-list@python.org 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: 57 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1346944827 news.xs4all.nl 6891 [2001:888:2000:d::a6]:44117 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:28609 On 06/09/2012 15:56, Tigerstyle wrote: > Hi guys, > > I'm trying to write a module containing a function to examine the contents of the current working directory and print out a count of how many files have each extension (".txt", ".doc", etc.) > > This is the code so far: > -- > import os > > path = "v:\\workspace\\Python2_Homework03\\src\\" > dirs = os.listdir( path ) > filenames = {"this.txt", "that.txt", "the_other.txt","this.doc","that.doc","this.pdf","first.txt","that.pdf"} > extensions = [] > for filename in filenames: > f = open(filename, "w") > f.write("Some text\n") > f.close() > name , ext = os.path.splitext(f.name) > extensions.append(ext) > > # This would print all the files and directories > for file in dirs: > print(file) > > for ext in extensions: > print("Count for %s: " %ext, extensions.count(ext)) > > -- > > When I'm trying to get the module to print how many files each extension has, it prints the count of each ext multiple times for each extension type. Like this: > > this.pdf > the_other.txt > this.doc > that.txt > this.txt > that.pdf > first.txt > that.doc > Count for .pdf: 2 > Count for .txt: 4 > Count for .doc: 2 > Count for .txt: 4 > Count for .txt: 4 > Count for .pdf: 2 > Count for .txt: 4 > Count for .doc: 2 > That's because each extension can occur multiple times in the list. Try the Counter class: from collections import Counter for ext, count in Counter(extensions).items(): print("Count for %s: " % ext, count)