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Date: Mon, 11 Feb 2013 09:22:19 -0500
From: Dave Angel <davea@davea.name>
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To: python-list@python.org
Subject: Re: Error in reading and writing CSV format file in python
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Xref: csiph.com comp.lang.python:38686

On 02/11/2013 06:00 AM, inshu chauhan wrote:
> In the programme below I am trying to read two csv format files and process
> them and write a new file with some of theirs data.
>
> import csv
> f1_reader = csv.reader(open(r"Z:\Weka
> work\Feature_Vectors_Fullset_00.arff"))
> f2_reader = csv.reader(open(r"Z:\Weka
> work\Feature_Vectors_Fullset_00_noxy+class.arff"))
> nf = open(r"Z:\Weka work\classified_image00_withoutxy.arff", "w")
>
> while True:
>      l1 = f1_reader.next()
>      while len(l1) != 12:
>          l1 = f1_reader.next()
>      l2 = f2_reader.next()
>      while len(l2) != 11:
>          l2 = f2_reader.next()
>
>      ix = l1[0].strip()
>      iy = l1[1].strip()
>      classification = l2[8].strip()
>
>      print >> nf, ix, iy, classification
>
> nf.close()
>
> This programme is giving me this error now :
>
> Traceback (most recent call last):
>    File "Z:\Weka work\final_image_classificationwithoutxy.py", line 16, in
> <module>
>      l2 = f2_reader.next()
> StopIteration
>
>
> what could be a possible reason to StopIteration ???
>
>
> I checked the syntax and usage of this module looks alright to me , but
> then why this error ?
>
>

That's not an error, it's just a normal way to end a for-loop.  If you 
were using a syntax like:
   for item in f2_reader:

the StopIteration would simply end the loop.  Since you're doing it 
manually, you have to handle the exception yourself.


-- 
DaveA