code: def del_restriction(self, command, user, event_types):
          
          if user.lower() in self.commands_rights[command]:
              for event_type in event_types:
                  try:
                      self.commands_rights[command][user.lower()].remove(event_type)
                  except ValueError:
                      pass
              if not self.commands_rights[command][user.lower()]:
                  self.commands_rights[command].pop(user.lower())
docs: Removes restriction for given `command`.
  
          :param command: command on which the restriction should be removed.
          :type command: str
          :param user: username for which restriction should be removed.
          :type user: str
          :param event_types: types of events that should be removed from restriction.
          :type event_types: list