Python - how to add "pipe" in exec_cmd method

Question

I have my python function which works perfectly in both windows and linux, when executing the command and processing the output.

def exec_cmd(cmd, fail=True):

    try:
        output = subprocess.check_output(cmd, stderr=subprocess.STDOUT)
        return output
    except subprocess.CalledProcessError as exc:
        logging.info(msg)

E.g.:

output = exec_cmd(['accurev', 'stat', '-a'], fail=False)

Now I would need to add "pipe" in order to grep the output within the command immediately.

Command:

accurev stat -a | find "(elink)"

Can you tell me how I can do it? Thanks