1. 首先，使用AWS Secrets Manager API获取凭据：

import boto3
from botocore.exceptions import ClientError

def get_secrets():
    secret_name = "your_secret_name"
    region_name = "your_region"

    session = boto3.session.Session()
    client = session.client(
        service_name='secretsmanager',
        region_name=region_name
    )

    try:
        get_secret_value_response = client.get_secret_value(SecretId=secret_name)
    except ClientError as e:
        if e.response['Error']['Code'] == 'ResourceNotFoundException':
            print("The requested secret " + secret_name + " was not found")
        elif e.response['Error']['Code'] == 'InvalidRequestException':
            print("The request was invalid due to:", e)
        elif e.response['Error']['Code'] == 'InvalidParameterException':
            print("The request had invalid params:", e)
    else:
        secret = get_secret_value_response['SecretString']
        return secret

2. 下一步是以编程方式读取和应用凭据。 例如，如果要连接到您的Postgres数据库，请使用以下代码：

import psycopg2

secret = json.loads(get_secrets())

try:
    conn = psycopg2.connect(
        dbname="your_database_name",
        user=secret['username'],
        password=secret['password'],
        host=secret['host'],
        port=secret['port']
    )
except psycopg2.Error as e:
    print('Unable to connect to the database:', e)

现在您可以使用连接对象（conn）执行查询或任何其他数据库操作。