code: def create_or_update_user(self, username, policies=None, groups=None, mount_point=DEFAULT_MOUNT_POINT):
          
          if policies is None:
              policies = []
          if groups is None:
              groups = []
          list_required_params = {
              'policies': policies,
              'groups': groups,
          }
          for param_name, param_arg in list_required_params.items():
              if not isinstance(param_arg, list):
                  error_msg = '"{param_name}" argument must be an instance of list or None, "{param_type}" provided.'.format(
                      param_name=param_name,
                      param_type=type(param_arg),
                  )
                  raise exceptions.ParamValidationError(error_msg)
  
          params = {
              'policies': ','.join(policies),
              'groups': ','.join(groups),
          }
          api_path = '/v1/auth/{mount_point}/users/{username}'.format(
              mount_point=mount_point,
              username=username,
          )
          return self._adapter.post(
              url=api_path,
              json=params,
          )
docs: Create or update LDAP users policies and group associations.
  
          Supported methods:
              POST: /auth/{mount_point}/users/{username}. Produces: 204 (empty body)
  
  
          :param username: The username of the LDAP user
          :type username: str | unicode
          :param policies: List of policies associated with the user. This parameter is transformed to a comma-delimited
              string before being passed to Vault.
          :type policies: str | unicode
          :param groups: List of groups associated with the user. This parameter is transformed to a comma-delimited
              string before being passed to Vault.
          :type groups: str | unicode
          :param mount_point: The "path" the method/backend was mounted on.
          :type mount_point: str | unicode
          :return: The response of the create_or_update_user request.
          :rtype: requests.Response