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08.06.2008 at 05:40PM PDT, ID: 23627865
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8.3

change a nested list value, python

Asked by sara_bellum in Python Scripting Language

Tags: , ,

I'm trying to
- read in the lines of a data file as lists with comma-separated values, and
- take the 2d value of each list and change it to increment from a certain number
This requirement came up because the original data file was missing data, and when you insert new data, the record numbers for each line have to be adjusted to increment by 1 from the point of insertion.  
len(row.split(",") recognizes that there are 5 comma-separated values in each line, but I can't access these values because row[1] counts characters, not fields.  
Also, I can't assign a new value to row[1], I get TypeError: object does not support item assignment.  
Any help you can provide is appreciated!Start Free Trial
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import csv, sys, string, fileinput
 
source = open('old.dat', 'r')
data = source.readlines()
index = 12305
for row in data[12305:] :
   while index < len(data):
       if len(row.split(",")) == 5:
           print row[1]
           #row[1] += (13748 + 1) //not sure about this - need to increment 13748 by 1 for each row starting at line 12305
           index += 1
source.close()
 
dest = open('new.dat', 'w')
dest.writelines(data)
dest.close()
[+][-]08.07.2008 at 12:46AM PDT, ID: 22178709

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[+][-]08.07.2008 at 12:51AM PDT, ID: 22178735

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[+][-]08.07.2008 at 01:27PM PDT, ID: 22185025

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[+][-]08.07.2008 at 01:30PM PDT, ID: 22185055

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[+][-]08.07.2008 at 10:54PM PDT, ID: 22187706

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[+][-]08.10.2008 at 11:12PM PDT, ID: 22202095

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About this solution

Zone: Python Scripting Language
Tags: Python, 2.4, new to python
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Solution Provided By: pepr
Participating Experts: 1
Solution Grade: A
 
 
[+][-]08.15.2008 at 09:23AM PDT, ID: 22239516

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[+][-]08.15.2008 at 09:47AM PDT, ID: 22239738

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[+][-]08.17.2008 at 11:39AM PDT, ID: 22247826

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[+][-]08.20.2008 at 04:17PM PDT, ID: 22274813

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