Files 2 - Python Programming for Beginners Practice Exercise 13

Exercise 13:

Create a program that opens file.txt. Read each line of the file and prepend it with a line number.

The contents of files.txt:

This is line one.
This is line two.
Finally, we are on the third and last line of the file.

Sample Output:

1: This is line one.
2: This is line two.
3: Finally, we are on the third and last line of the file.

Solution:

#!/usr/bin/env python3
 
with open('file.txt') as file:
    line_number = 1
    for line in file:
        print('{}: {}'.format(line_number, line.rstrip()))
        line_number += 1