@expose(methods='DELETE')
  def delete(self, key):
    '''Remove entry.
    '''
    utf8_key = key.encode('utf-8')
    if utf8_key not in self.entries:
      raise http.NotFound(key % u'no such entry %r')
    del self.entries[utf8_key]
dataset/ETHPy150Open rsms/smisk/examples/mvc/key-value-store/app.py/root.delete/swapped operands of `%`