llvm/utils/lit/tests/Inputs/shtest-shell/check_args.py

#!/usr/bin/env python

import argparse
import platform

parser = argparse.ArgumentParser()
parser.add_argument("--my_arg", "-a")

args = parser.parse_args()

answer = (platform.system() == "Windows" and
          args.my_arg == "/dev/null" and "ERROR") or "OK"

print(answer)