Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed1.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; 'error:': 0.05; 'mrab': 0.05; 'escape': 0.07; 'skip:o 50': 0.07; 'subject:help': 0.07; '"w")': 0.09; 'backslash': 0.09; 'ioerror:': 0.09; 'literal': 0.09; 'rows': 0.09; 'skip:r 50': 0.09; 'tab': 0.09; 'stored': 0.10; "'/'": 0.16; "(it's": 0.16; '(windows': 0.16; 'backslashes': 0.16; 'csv': 0.16; 'initially,': 0.16; 'literal,': 0.16; 'literals': 0.16; 'recognise': 0.16; 'sequence,': 0.16; 'skip:g 50': 0.16; 'traceback.': 0.16; 'writer': 0.16; 'string': 0.17; 'wrote:': 0.17; 'skip:g 40': 0.17; 'subject:need': 0.17; 'feb': 0.19; 'equivalent': 0.20; 'skip:" 40': 0.20; 'to:name:python- list@python.org': 0.20; 'import': 0.21; 'occurs': 0.22; "skip:' 40": 0.22; 'allows': 0.25; 'header:In-Reply-To:1': 0.25; '(most': 0.27; 'raw': 0.27; 'merge': 0.27; 'message-id:@mail.gmail.com': 0.27; 'character.': 0.29; 'url:mailman': 0.29; 'character': 0.29; 'starts': 0.29; 'skip:& 10': 0.29; 'folder': 0.30; 'mode': 0.30; 'subject: : ': 0.30; 'url:python': 0.32; 'file': 0.32; 'url:listinfo': 0.32; 'says': 0.33; 'traceback': 0.33; 'problem': 0.33; 'to:addr:python-list': 0.33; 'equal': 0.33; 'skip:& 20': 0.33; "can't": 0.34; 'received:google.com': 0.34; 'thanks': 0.34; 'path': 0.35; 'sequence': 0.35; 'pm,': 0.35; 'but': 0.36; 'url:org': 0.36; 'should': 0.36; 'why': 0.37; 'subject:: ': 0.38; 'files': 0.38; 'instead': 0.39; 'to:addr:python.org': 0.39; 'skip:" 10': 0.40; 'url:mail': 0.40; "you'll": 0.62; 'here': 0.65; 'programme': 0.69; '2013': 0.84; 'treats': 0.84; 'subject:urgent': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:content-type; bh=Pnp1gdJwxD8Yg+wMkxc00OCCpVSdLh+QOnr7ZMFl65U=; b=PsiUmeiyLvjp/REaVR9UjidzXgVFYbG3SFA2UQDKzMYdGy0UzBvRX1hHLGjMbbFgwf zA96ha55z0XIb95a4NnaH1zs4RMMwPLX1dn+sOK0s9qf91VNUguHCQVGNR+MDhRoB4gj RxjeEVKDsnXcoNG2xMCq0fymHDGHGTdw5BrmA7bQ3S3Yvuf4xQfEFgexkKjYpDvxGlMH k3L8ttSOSs1fNE57eRqNtTUIfPZW6IbZXPA1mdhYyt3C67miAVb+61tTxdyx1x2GjJae j37rBaXY0Axj92K07Z+t1DK1/Q/18KVg7w49YeKa0sEDU9nD8e1BR8Mcf+MfZoIJDkMp O0WA== MIME-Version: 1.0 X-Received: by 10.50.33.203 with SMTP id t11mr8585810igi.97.1361289509852; Tue, 19 Feb 2013 07:58:29 -0800 (PST) In-Reply-To: <5123A03F.1000705@mrabarnett.plus.com> References: <5123A03F.1000705@mrabarnett.plus.com> Date: Tue, 19 Feb 2013 16:58:29 +0100 Subject: Re: IOerror : need urgent help From: inshu chauhan To: "python-list@python.org" Content-Type: multipart/alternative; boundary=f46d044788dbabd7da04d615e927 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: 143 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1361289519 news.xs4all.nl 6961 [2001:888:2000:d::a6]:51653 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:39241 --f46d044788dbabd7da04d615e927 Content-Type: text/plain; charset=ISO-8859-1 On Tue, Feb 19, 2013 at 4:54 PM, MRAB wrote: > On 2013-02-19 15:27, inshu chauhan wrote: > >> Here is my attempt to merge 10 files stored in a folder into a single >> file : >> >> import csv >> >> with open("C:\Users\inshu.chauhan\**Desktop\test.arff", "w") as w: >> writer = csv.writer(w) >> for f in glob.glob("C:\Users\inshu.**chauhan\Desktop\For >> Model_600\*.arff"): >> rows = open(f, "r").readlines() >> writer.writerows(rows) >> >> >> Error: >> >> Traceback (most recent call last): >> File "C:\Users\inshu.chauhan\**Desktop\Mergefiles.py", line 3, in >> >> with open("C:\Users\inshu.chauhan\**Desktop\test.arff", "w") as w: >> IOError: [Errno 22] invalid mode ('w') or filename: >> 'C:\\Users\\inshu.chauhan\\**Desktop\test.arff' >> >> Why my programme is not working ?? :( >> >> Look at the traceback. It says that the path is: > > 'C:\\Users\\inshu.chauhan\\**Desktop\test.arff' > > All but one of the backslashes are doubled. > > That's because the backslash character \ starts an escape sequence, but > if it can't recognise the escape sequence, it treats the backslash as a > literal character. > > In that string literal, '\t' is an escape sequence representing a tab > character (it's equal to chr(9)), but '\U', '\i' and '\D' are not > escape sequences, so they are equivalent to '\\U, '\\i' and '\\D' > respectively. > > What you should do is use raw string literals for paths: > > > r"C:\Users\inshu.chauhan\**Desktop\test.arff" > > or use '/' instead (Windows allows it as an alternative, unless it > occurs initially, which you'll rarely want to do in practice): > > "C:/Users/inshu.chauhan/**Desktop/test.arff" > > -- > http://mail.python.org/**mailman/listinfo/python-list > Thanks I understood the problem now and my programme is working !! --f46d044788dbabd7da04d615e927 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable



On Tue, Feb 19, 2013 at 4:54 PM, MRAB <python@mrabarnett.= plus.com> wrote:
On 2= 013-02-19 15:27, inshu chauhan wrote:
Here is my attempt to merge 10 files stored in a folder into a single file = :

import csv

with open("C:\Users\inshu.chauhan\Desktop\test.arff", &quo= t;w") as w:
=A0 =A0 =A0writer =3D csv.writer(w)
=A0 =A0 =A0for f in glob.glob("C:\Users\inshu.chauhan\Desktop\F= or
Model_600\*.arff"):
=A0 =A0 =A0 =A0 =A0rows =3D open(f, "r").readlines()
=A0 =A0 =A0 =A0 =A0writer.writerows(rows)


Error:

Traceback (most recent call last):
=A0 =A0File "C:\Users\inshu.chauhan\Desktop\Mergefiles.py"= , line 3, in <module>
=A0 =A0 =A0with open("C:\Users\inshu.chauhan\Desktop\test.arff&= quot;, "w") as w:
IOError: [Errno 22] invalid mode ('w') or filename:
'C:\\Users\\inshu.chauhan\\Desktop\test.arff'

Why my programme is not working ?? :(

Look at the traceback. It says that the path is:

'C:\\Users\\inshu.chauhan\\Desktop\test.arff'

All but one of the backslashes are doubled.

That's because the backslash character \ starts an escape sequence, but=
if it can't recognise the escape sequence, it treats the backslash as a=
literal character.

In that string literal, '\t' is an escape sequence representing a t= ab
character (it's equal to chr(9)), but '\U', '\i' and &#= 39;\D' are not
escape sequences, so they are equivalent to '\\U, '\\i' and = 9;\\D'
respectively.

What you should do is use raw string literals for paths:
<= br>
r"C:\Users\inshu.chauhan\Desktop\test.arff"

or use '/' instead (Windows allows it as an alternative, unless it<= br> occurs initially, which you'll rarely want to do in practice):

"C:/Users/inshu.chauhan/Desktop/test.arff"

--
http://mail.python.org/mailman/listinfo/python-list

Thanks I understood the proble= m now and my programme is working !!
=A0

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