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To: python-list@python.org
From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: IOerror : need urgent help
Date: Tue, 19 Feb 2013 15:49:18 +0000
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Xref: csiph.com comp.lang.python:39235

On 19/02/2013 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 <module>
>      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 ?? :(
>
> Thanks in Advance !!
>

Use a raw string for the output file name or forward instead of back 
slashes.  Explanation here 
http://docs.python.org/2/reference/lexical_analysis.html

-- 
Cheers.

Mark Lawrence