MongoDB: How to use PyMongo to connect to a database with username and password?

scene description

Usually, when using PyMongo to connect to the MongoDB database in an offline environment, it is connected to a database without a user name and password, so how to connect to a MongoDB database (online environment) with a user name and password?

code example

Option One

NOTE : This method was removed in PyMongo 4.x ! ! !

import pymongo

client = pymongo.MongoClient(host='host', port=27017)
# info_data 需要用户名和密码进行身份认证的数据库
db = client.info_data
# username：用户名；password：密码
db.authenticate('username', 'password')
print(db.list_collection_names())

Option II

import pymongo

client = pymongo.MongoClient(
    # 主机
    host=host,
    # 端口
    port=port,
    # 用户名
    username=username,
    # 密码
    password=password,
    # 需要用户名和密码进行身份认证的数据库
    authSource='info_data'
)
db = client.info_data
print(db.list_collection_names())

third solution

import pymongo

client = pymongo.MongoClient('mongodb://username:password@host:port/?authSource=info_data')
db = client.info_data
print(db.list_collection_names())

username: username
password: password
host: host
port: port
info_data: database that requires username and password for authentication