'''
 This program does this:
 opens a file for reading
 opens another file for writing
 each number is read, multiplied by 2, and written to the output file
'''

input_file_name = 'numbers.txt'
output_file_name = 'numbers_doubled.txt'

in_handle = open(input_file_name, 'r')
out_handle = open(output_file_name, 'w')

lines = in_handle.readlines()
for line in lines:
    fields = line.split()
    for field in fields:
        number = int(field)
        number *= 2
        out_handle.write(str(number) + ' ')
    out_handle.write('\n')

in_handle.close()
out_handle.close()