Error in reading and writing CSV format file in python

inshu chauhan insideshoes at gmail.com
Mon Feb 11 15:42:18 CET 2013


On Mon, Feb 11, 2013 at 3:22 PM, Dave Angel <davea at davea.name> wrote:

> 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
> --
> http://mail.python.org/**mailman/listinfo/python-list<http://mail.python.org/mailman/listinfo/python-list>
>

Yes , therefore I used try and except.
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