使用python检查dynamodb表中是否存在值，并获取该记录

pip install boto3

import boto3
from botocore.exceptions import ClientError

dynamodb = boto3.client('dynamodb')

def check_dynamodb_table(table_name, key):
    try:
        response = dynamodb.get_item(
            TableName=table_name,
            Key=key
        )
        item = response.get('Item')
        if item:
            return item
        else:
            return None
    except ClientError as e:
        print(e.response['Error']['Message'])
        return None

table_name = 'your_table_name'
key = {
    'your_primary_key': {'S': 'your_value'}
}

result = check_dynamodb_table(table_name, key)
if result:
    print("记录存在：", result)
else:
    print("记录不存在")