Check if proxy for this name is running

def _is_proxy_running(proxyname):
    '''
    Check if proxy for this name is running
    '''
    cmd = ('ps ax | grep "salt-proxy --proxyid={0}" | grep -v grep'
           .format(salt.ext.six.moves.shlex_quote(proxyname)))
    cmdout = __salt__['cmd.run_all'](
        cmd,
        timeout=5,
        python_shell=True)
    if not cmdout['stdout']:
        return False
    else:
        return True