To track manager status in Python, the API can be queried repeatedly using the URI to access the Manager object and the managerRunState property value can be tested to determine whether or not the Oracle VM Manager instance has RUNNING runtime status. To keep the script polite, use the time library to sleep between requests. Since this is functionality that may be used repeatedly at different stages in a program, it is better to define it as a function:

...
def check_manager_state(baseUri,s):
        while True:
            r=s.get(baseUri+'/Manager')
            manager=r.json()
            if manager[0]['managerRunState'].upper() == 'RUNNING':
                break
            time.sleep(1)
         return;
        

In this function, the while True: statement creates an infinite loop. The requests library session object is used to submit a GET request to the appropriate URI and the response content is converted from JSON into a python data object. The object is a list that contains a dictionary with all of the Manager object properties as keys. We use an if statement to test the managerRunState property to see whether it matches the string value 'RUNNING'. If a match is found, the infinite loop is broken and the function can return. If a match is not found, the time.sleep statement causes the function to wait for one second before submitting the next request, so that requests take place over a sensible period.

Usually, you would insert a call to this function directly after you authenticate, as described in Section 2.6.1, “Authenticating”. You may even incorporate this code into your authentication process, so that it is called whenever an authentication request is made within your application.