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" #778

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(/sitelet?url=https%3A%2F%2Fgithub.com%2Fappium%2Fpython-client%2Fissues%2Fhost%2C%2520port%2C%2520status_url_path%2C%2520timeout_ms))):
//added brackets after not