如何知道查询是否不返回文档

const MongoClient = require('mongodb').MongoClient;

async function checkIfDocumentsExist() {
  const uri = 'mongodb://localhost:27017';
  const client = new MongoClient(uri);

  try {
    await client.connect();

    const database = client.db('mydb');
    const collection = database.collection('mycollection');

    const query = { name: 'John' };
    const result = await collection.find(query).toArray();

    if (result.length === 0) {
      console.log('No documents found.');
    } else {
      console.log('Documents found:', result);
    }
  } finally {
    await client.close();
  }
}

checkIfDocumentsExist();

from pymongo import MongoClient

def check_if_documents_exist():
    client = MongoClient('mongodb://localhost:27017')
    database = client['mydb']
    collection = database['mycollection']

    query = { 'name': 'John' }
    count = collection.count_documents(query)

    if count == 0:
        print('No documents found.')
    else:
        print('Documents found:', count)

check_if_documents_exist()