How do I change a line in a data file iterated in Python?

Question

Oops! I’m trying to create a Python script that reads an external data file, which has several rows and different column numbers. The script I created follows below:`

import numpy as np

entrada = open('dados.dat', 'r')
lista_de_linhas = entrada.readlines()
valor = int(52)
if (lista_de_linhas[72]):
    j=0
    comprimento = len(lista_de_linhas[72])
    print comprimento
    for j in range( 0, (comprimento) ):
        fsaida=open('dados_%i.dat' % (j+1), 'w')
        i = 0
        while i in range( 0, (comprimento) ):
            if (j==i):
                fsaida.write ('%f' % valor)
            else:
                fsaida.write ('%f' % 0)
            break

The script reads the entire input file. I wanted to make a change to line 72 of that file which is a line this way:

I wanted the script to generate, for each output file, a line 72 with a value of 52 and the rest of the values all equal to zero. For example: the output file 1 should have the first value of the column equal to 52 and the rest all null. The second data file should have the second value equal to 52 and the remaining null and so on. But I’m not getting the script to iterate the columns. Can someone help me???

Answer 1

You can and should use the function iteritems();

Thus:

for x, y in lista_de_linhas.iteritems():

Then just follow your logic.

Python - Iteritems()