Sum of strings extracted from text file using regex

Question

I am just learning python and need some help for my class assignment.

I have a file with text and numbers in it. Some lines have from one to three numbers and other

Answer 1

Here is my solution to this problem.

import re

file = open('text_numbers.txt')
sum = 0 

for line in file:
    line = line.rstrip()
    line = re.findall('([0-9]+)', line)
    for i in line:
        i = int(i)
        sum += i    

print(sum)

The line elements in first for loop are the lists also and I used second for loop to convert its elements to integer from string so I can sum them.