How to read numbers in text file as numbers in to list?

Question

I have a text file in which there are numbers in each line(only numbers). My color.txt looks like:

When I read this to list using

f=open('D:\\Emmanu\\project-data\\color.txt',"r")
    for line in f:
        g_colour_list.append(line.strip('\n'))
    print g_colour_list

the output is like

['3', '3', '5', '1', '5', '1', '5']

But I want it as:

[3,3,5,1,5,1,5]

How can I do that in the single line that is
g_colour_list.append(line.strip('\n'))?

So...you have a list of strings, and you want a list of integers. I bet you can find instructions for converting numeric strings to integers if you look for it. — larsks, Apr 23 '16 at 12:46

score 2 · Accepted Answer · answered Apr 23 '16 at 12:46

2

just cast your strings into integers:

g_colour_list.append(int(line.strip('\n')))

answered Apr 23 '16 at 12:46

mvelay

1

There is no need to strip, as `int()` ignores leading and trailing whitespace. – Martijn Pieters Feb 12 '21 at 19:28

score 1 · Answer 2 · answered Apr 23 '16 at 12:46

Wrap a call to python's int function which converts a digit string to a number around your line.strip() call:

f=open('D:\\Emmanu\\project-data\\color.txt',"r")
    for line in f:
        g_colour_list.append(int(line.strip('\n')))
    print g_colour_list

score 1 · Answer 3 · answered Apr 23 '16 at 12:51

1

One possible solution is to cast the string to integer on appending. You can do it this way :

g_colour_list.append(int(line.strip('\n')))

If you think you will get floats as well then you should use float() instead of int().

answered Apr 23 '16 at 12:51

Julien Salinas

score 0 · Answer 4 · answered Apr 23 '16 at 12:48

0

for line in f:
    g_colour_list.append(int(line.strip('\n')))

You can parse a string s to int with int(s)

answered Apr 23 '16 at 12:48

Keiwan

score 0 · Answer 5 · edited Apr 23 '16 at 13:00

0

You can typecast it to int, doing:

f = open('color.txt',"r")
g_colour_list=[]

for line in f:
    g_colour_list.append(int(line.strip('\n')))

print (g_colour_list)

edited Apr 23 '16 at 13:00

fredmaggiowski

answered Apr 23 '16 at 12:53

lakshman sai

5 Answers5