Write HEX into file in multiple line

[snippsat]

How do i also write data.txt into data_out.txt i wants to write data.txt into data_out.txt

with open('data.txt') as f,open('data_out.txt', 'w') as f_out:
    for line in f:
        line = line.strip()
        f_out.write('{} {}\n'.format(line, hex(int(line))))

f-string 3.6:

with open('data.txt') as f,open('data_out.txt', 'w') as f_out:
    for line in f:
        line = line.strip()
        f_out.write(f'{line} {hex(int(line))}\n')