Path: csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!newsfeed.hal-mli.net!feeder1.hal-mli.net!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; 'argument': 0.04; 'subject:skip:s 10': 0.05; 'complaining': 0.09; 'errors:': 0.09; 'extension,': 0.09; 'unpack': 0.09; 'file,': 0.15; 'csv': 0.16; 'csv,': 0.16; 'data)': 0.16; 'from:addr:mrabarnett.plus.com': 0.16; 'from:addr:python': 0.16; 'from:name:mrab': 0.16; "isn't.": 0.16; 'message-id:@mrabarnett.plus.com': 0.16; 'node.': 0.16; 'received:84.93': 0.16; 'received:84.93.230': 0.16; 'reproduce': 0.16; 'subject:issue': 0.16; 'which,': 0.16; 'string': 0.17; 'wrote:': 0.17; 'tries': 0.17; 'import': 0.21; 'struct': 0.22; "i've": 0.23; 'header:In-Reply-To:1': 0.25; 'header:User-Agent:1': 0.26; 'looks': 0.26; '(most': 0.27; 'i.e.': 0.27; 'instead.': 0.27; 'lines': 0.28; 'node': 0.29; 'received:192.168.1.3': 0.29; 'read,': 0.29; 'file': 0.32; 'received:84': 0.32; 'print': 0.32; 'traceback': 0.33; 'to:addr:python-list': 0.33; 'text': 0.34; 'list': 0.35; 'lists.': 0.35; 'said,': 0.35; 'but': 0.36; 'subject:with': 0.36; 'data': 0.37; 'subject:: ': 0.38; 'to:addr:python.org': 0.39; 'received:192': 0.39; 'received:192.168': 0.40; 'series': 0.63; 'header:Reply-To:1': 0.68; 'below:': 0.71; 'reply-to:no real name:2**0': 0.72; 'reply- to:addr:python.org': 0.84 X-CM-Score: 0.00 X-CNFS-Analysis: v=2.0 cv=IekFqBWa c=1 sm=1 a=0nF1XD0wxitMEM03M9B4ZQ==:17 a=DKcI9XZsuF4A:10 a=ihvODaAuJD4A:10 a=OUOv7kDek9cA:10 a=8nJEP1OIZ-IA:10 a=yG90urYR2E8A:10 a=EBOSESyhAAAA:8 a=8AHkEIZyAAAA:8 a=fZnMoana3Hbipd0u_n0A:9 a=wPNLvfGTeEIA:10 a=0nF1XD0wxitMEM03M9B4ZQ==:117 X-AUTH: mrabarnett:2500 Date: Tue, 28 Aug 2012 23:49:50 +0100 From: MRAB User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: python-list@python.org Subject: Re: issue with struct.unpack References: <2cc8b390-0b7a-4a0f-ac88-113daf65eba5@googlegroups.com> <5653b3e0-1e37-4f70-8257-6630eacdce5f@googlegroups.com> In-Reply-To: <5653b3e0-1e37-4f70-8257-6630eacdce5f@googlegroups.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 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: 36 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1346194193 news.xs4all.nl 6962 [2001:888:2000:d::a6]:35126 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:28029 On 28/08/2012 23:34, 9bizy wrote: > This is what I have to reproduce the challenge I am having below: > > > import csv > import struct > > > data = [] > > for Node in csv.reader(file('s_data.xls')): That tries to read the file as CSV, but, judging from the extension, it's in Excel's format. You don't even use what is read, i.e. Node. > data.append(list((file('s_data.xls')))) > That opens the file again and 'list' causes it to read the file as though it were a series of lines in a text file, which, as I've said, it looks like it isn't. The list of 'lines' is appended to the list 'data', so that's a list of lists. > > data = struct.unpack('!B4HH', data) > print "s_data.csv: ", data > > I tries so many format for the struct.unpack but I got this errors: > > Traceback (most recent call last): > > data = struct.unpack('!B4HH', data) > struct.error: unpack requires a string argument of length 11 > [snip] It's complaining because it's expecting a string argument but you're giving it a list instead.