A question about subprocess taking input from command line and returning output!

[Gribouillis]

Replace sys.stdin.read() with pathlib.Path('ABC.pdb').read_text() and replace print(output) with pathlib.Path('ABC.txt').write_text(output). Use the argparse module to get the file names from the command line.

The script I have written below

In 2019, use python 3.