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

[Aurimas]

Dear Python forum members,

The script I have written below (the_script.py) works fine with this terminal command at MAC OS Mojave Python 2.7:

python the_script.py < ABC.pdb > ABC.txt

! However I want my script (the_script.py below) written through terminal to be like this:

python the_script.py ABC.pdb

!
And not involve < or > and return the output to ABC.txt. The .pdb file is a text file as well.

#!/usr/bin/python2

import sys

import subprocess

process = subprocess.Popen(
		["voronota","get-balls-from-atoms-file","--annotated"],stdin=subprocess.PIPE,
		stdout=subprocess.PIPE)

output=process.communicate(sys.stdin.read())[0];

print output

I will look forward to all the replies.

Sincerely,
Aurimas