null value in JSON is not interpreted by python for openstack API
Question: I am using OpenStack's REST API for programmatic implementation of start or
stop server.

The link for API reference is <http://api.openstack.org/api-ref.html#ext-os-
server-start-stop> This requires a dictionary in python as follows:

    
    
    dict = {
         os-start:null
        } 
    

Then I am doing a json.dumps(dict) and making a post request to the
openstack's public URL for nova module.

When I run this program ,error of unknown global name "null". Hence, its not
working.

I want to know for this request of starting the server on OpenStack to work ,
what should I use as the value of field "os-start" in request JSON.

Let me know if any additional information is needed.

Thank you in advance.


Answer: Python's `None` singleton is translated to a JSON `null`, and vice versa. Use
that instead:

    
    
    >>> import json
    >>> json.dumps({'os-start': None})
    '{"os-start": null}'
    >>> json.loads('{"os-start": null}')
    {u'os-start': None}
    

