<s>[INST] import sys
import itertools

def sum_of_integers(filename):
    file = open(filename, 'r')
    lines = file.readlines()
    file.close()
    total_sum = 0

    for line in lines:
        j = line.split(',')
        for element in itertools.chain.from_iterable(j):
	    total_sum += int(element)

    print(total_sum)

sum_of_integers('file.txt')

Each time I run the above script, it prints `0` though the file exists and has the file contents as:

`5,4,,1,2,3`

There are some issues with this script.  Can you please provide me the the corrected version?[/INST]