[Tutor] reading from 2 file output to 1

[Nitin Das]

I think in both the while loops , for loops are iterating over the new
lines, as a result col1,col2,col3,col4,col5,col6,col7 as a result after both
the while loop finishes these colums would only be having the values of the
last lines from both the files. as a result the new file3 would only be
having last lines of the both the files appended together, because u r
combining the columns after both the while loops.

--nitin

On Tue, Aug 17, 2010 at 2:09 PM, nitin chandra <nitinchandra1 at gmail.com>wrote:

> Hello All,
>
> I am trying to read from 2 CSV files, where first 4 ([0,1,2,3])
> columns are read from 'file1' and 3 columns ([1,2,3]) from 'file2' and
> write them into a 3rd file 'file3', 7 columns string. The data is
> Numeric values both, +ve and -ve.
>
> this is how i was trying.
>
> ******************************************
> import sys,os, fileinput
>
>
> file11 = raw_input('Enter PR1 File name :')
> fp1 = open(file11,'r')
>
> file12 = raw_input('Enter PR3 File Name :')
> fp2 = open(file12,'r')
>
>
> while 1:
>    fp1 = fp1.readline()
>      for line in fp1:
>         line2 = line.split(",")
>         col1 = line2[0]
>         col2 = line2[1]
>         col3 = line2[2]
>         col4 = line2[3]
>         print col1
>         print col2
>         FL1 = '%s,%s,%s,%s' % (col1,col2,col3,col4)
>         print FL1
>
> while 1:
>    fp2 = fp2.readline()
>       for line1 in fp2:
>          line3 = line1.split(",")
>          col5 = line3[1]
>          col6 = line3[2]
>          col7 = line3[3]
>
>          FL2 = '%s,%s,%s,' % (col5,col6,col7)
>          print FL2
>
> file3=raw_input('Enter PR2 OUTPUT File Name :')
> fp3 = open(file3,'w')
>
> print col1,col2,col3,col4 + ',' + col5,col6,col7
>
> str3 = '%s,%s,%s,%s,%s,%s,%s\n' % (col1,col2,col3,col4,col5,col6,col7)
> fp3.write(str3)
>
> **********************************************
>
> I am getting the following error :
>
> Traceback (most recent call last):
>  File "mer5Pr2.py", line 16, in <module>
>    col2 = line2[1]
> IndexError: list index out of range
>
> *********************************************************
>
> There is data in the file at 'col2'. So what am i missing / doing wrong ?
>
> And is there better / optimized way of doing it?
>
> Thanks
>
> Nitin
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