code: def assign_issue(self, issue, assignee):
          
          url = self._options['server'] + \
              '/rest/api/latest/issue/' + str(issue) + '/assignee'
          payload = {'name': assignee}
          r = self._session.put(
              url, data=json.dumps(payload))
          raise_on_error(r)
          return True
docs: Assign an issue to a user. None will set it to unassigned. -1 will set it to Automatic.
  
          :param issue: the issue ID or key to assign
          :type issue: int or str
          :param assignee: the user to assign the issue to
          :type assignee: str
  
          :rtype: bool