Getting download links

# Watch video here: https://www.youtube.com/watch?v=p_F3ODBiCBw

from sys import argv

script, input_file, output_file, keyword = argv

input_file = open(argv[1]).readlines()
output_file = open(argv[2], 'w')


for item in input_file:
    if item.find(argv[3]) != -1:
        output_file.write(item)

output_file.close()