code: def remove_role_from_user(self, user, role):
          
          rv = False
          user, role = self._prepare_role_modify_args(user, role)
          if role in user.roles:
              rv = True
              user.roles.remove(role)
              self.put(user)
          return rv
docs: Removes a role from a user.
  
          :param user: The user to manipulate
          :param role: The role to remove from the user