Python: Sum of numbers in a file

In this exercise we have a file called numbers.txt that has numbers in it and we need to sum the numbers.

examples/data/numbers.txt

3
7
23
0
-17
98
12

The following file has two solutions:

examples/python/sum_of_numbers.py

import sys

if len(sys.argv) < 2:
    exit("Usage: {} FILENAME".format(sys.argv[0]))

filename = sys.argv[1]

total1 = 0
with open(filename) as fh:
    for line in fh:
        total1 += int(line)
print(total1)


with open(filename) as fh:
    total2 = sum(map(int, fh.readlines()))
print(total2)