subprocess.check_output return code

Question

I am using:

grepOut = subprocess.check_output(\"grep \" + search + \" tmp\", shell=True)

To run a terminal command, I know that I can use a

Answer 1

Python 3.5 introduced the subprocess.run() method. The signature looks like:

subprocess.run(
  args, 
  *, 
  stdin=None, 
  input=None, 
  stdout=None, 
  stderr=None, 
  shell=False, 
  timeout=None, 
  check=False
)

The returned result is a subprocess.CompletedProcess. In 3.5, you can access the args, returncode, stdout, and stderr from the executed process.

Example:

>>> result = subprocess.run(['ls', '/tmp'], stdout=subprocess.DEVNULL)
>>> result.returncode
0

>>> result = subprocess.run(['ls', '/nonexistent'], stderr=subprocess.DEVNULL)
>>> result.returncode
2