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

import re
sample = open ('text_numbers.txt')
total =0
dignum = 0 

for line in sample:
    line = line.rstrip()
    dig= re.findall('[0-9]+', line)

    if len(dig) >0:
        dignum += len(dig)
        linetotal= sum(map(int, dig))
        total += linetotal

print 'The number of digits are:  ' 
print dignum
print 'The sum is: '
print total     
print 'The sum ends with: '
print  total % 1000