A snippet code to call pipeline command line in Python programming language

cmd.py

import subprocess

def _call(c, stdin=subprocess.PIPE):

    command = subprocess.Popen(c,
                            stdin = stdin,
                            stdout=subprocess.PIPE,
                            stderr=subprocess.PIPE,
                            )
    return command.stdout, command.stderr, command
    
def call(*iterables):
    first_cmd = iterables[0]
    out, err, c = _call(first_cmd)
    if len(iterables) == 1:
        final_out, final_err = c.communicate()
        return (final_out.decode('utf-8'), final_err.decode('utf-8'))

    for c in iterables[1:]:
        out, err, c = _call(c, out)

    final_out, final_err = c.communicate()
    return (final_out.decode('utf-8'), final_err.decode('utf-8'))
  
  
out, err = call(['ps', '-ef',], ['grep', 'ipfs'], ['grep', 'a'])