code: def getRolesForUser(self, username, filter=None, maxCount=None):
          
          uURL = self._url + "/roles/getRolesForUser"
          params = {
              "f" : "json",
              "username" : username
          }
          if filter is not None:
              params['filter'] = filter
  
          if maxCount is not None:
              params['maxCount'] = maxCount
          return self._post(url=uURL, param_dict=params,
                               securityHandler=self._securityHandler,
                               proxy_url=self._proxy_url,
                               proxy_port=self._proxy_port)
docs: This operation returns a list of role names that have been
             assigned to a particular user account.
             Inputs:
                username - name of the user for whom the returned roles
                filter - filter to be applied to the resultant role set.
                maxCount - maximum number of results to return for this query