code: def create_subnet(self, subnet, prefix, **kwargs):
          
          data = {"prefix": prefix}
          data.update(kwargs)
          return self._request("POST", "subnet/{0}".format(subnet), data)
docs: Create a subnet.
  
          :param subnet: Name of subnet to be created.
          :type subnet: str
          :param prefix: Routing prefix of subnet to be created.
          :type prefix: str
          :param \*\*kwargs: See the REST API Guide on your array for the
                             documentation on the request:
                             **POST subnet/:subnet**
          :type \*\*kwargs: optional
  
          :returns: A dictionary describing the created subnet.
          :rtype: ResponseDict
  
          .. note::
  
              prefix should be specified as an IPv4 CIDR address.
              ("xxx.xxx.xxx.xxx/nn", representing prefix and prefix length)
  
          .. note::
  
              Requires use of REST API 1.5 or later.