def getPIDforProcessName(processname):
    cmd = ['/bin/ps', '-eo', 'pid=,command=']
    try:
        proc = subprocess.Popen(cmd, shell=False, bufsize=-1,
                                stdin=subprocess.PIPE, stdout=subprocess.PIPE,
                                stderr=subprocess.STDOUT)
    except OSError:
        return 0

    while True:
        line = proc.stdout.readline().decode('UTF-8')
        if not line and (proc.poll() != None):
            break
        line = line.rstrip('\n')
        if line:
            try:
                (pid, process) = line.split(None, 1)
            except ValueError:
                # funky process line, so we'll skip it
                pass
            else:
                if process.find(processname) != -1:
                    return str(pid)

    return 0
Returns a process ID for processname
dataset/ETHPy150Open munki/munki/code/client/munkilib/utils.py/getPIDforProcessName