I was seeing an issue at def start(self, **kwargs: Any) -> sp.Popen: function with error, "Appium has failed to start on {host}:{port} within {timeout_ms}ms timeout"

Appium was not starting on Mac with python3.7 via code

Solution:
Made a change at
if not(self.is_running or (timeout_ms > 0 and not poll_url(host, port, status_url_path, timeout_ms))):
//added brackets after not

Would you like to submit this fix as a pull request, then?