Boto3-如何使用Python Boto3从scan（）输出中过滤出attributeType？

Question

我正在使用Boto3从小型dynamoDB表中检索并返回所有数据。我的目标是从输出中删除attributeTypes。

以下是我的输出：

    {"Items": [{"PresidentialCandidate_ID": {"S": "Trump"}, "Vote": {"N": "47"}}, {"PresidentialCandidate_ID": {"S": "Stein"}, "Vote": {"N": "16"}}, {"PresidentialCandidate_ID": {"S": "Dwayne"}, "Vote": {"N": "1"}}, {"PresidentialCandidate_ID": {"S": "none"}, "Vote": {"N": "11"}}, {"PresidentialCandidate_ID": {"S": "Johnson"}, "Vote": {"N": "13"}}, {"PresidentialCandidate_ID": {"S": "Clinton"}, "Vote": {"N": "22"}}], "Count": 6, "ScannedCount": 6}

我想要的输出：

    {"Items":[{"PresidentialCandidate_ID":"Trump","Vote":47},{"PresidentialCandidate_ID":"Stein","Vote":16},{"PresidentialCandidate_ID":"Dwayne","Vote":1},{"PresidentialCandidate_ID":"none","Vote":11},{"PresidentialCandidate_ID":"Johnson","Vote":13},{"PresidentialCandidate_ID":"Clinton","Vote":22}],"Count":6,"ScannedCount":6}

我尝试了以下操作：

    import boto3
    import json
    dynamodb = boto3.client('dynamodb')

    def lambda_handler(event, context):

        table = dynamodb.scan(TableName="PresidentialCandidate", ConsistentRead=True)
        del table['ResponseMetadata']
        table = json.dumps(table)
        print(table)

    return {
    }

关于如何过滤出attributeType以获取所需输出的任何建议？

Answer 1

您只能尝试使用此代码以所需的方式返回数据。

import boto3
import json

dynamodb = boto3.client('dynamodb')


def lambda_handler(event, context):
    table = dynamodb.scan(TableName="PresidentialCandidate", ConsistentRead=True)
    items = table['Items']

    idx = 0
    for item in items:
        for key in item:
            value = list(item[key].values())[0]
            items[idx][key] = value
        idx += 1
    return items

您还可以将所需的新格式对象一次存储到表中。这样，attributeTypes将不再反映出来，并且没有attributeTypes也可以得到结果。您可以尝试以下代码：）

import boto3
import json

dynamodb = boto3.client('dynamodb')


def lambda_handler(event, context):
    table = dynamodb.scan(TableName="PresidentialCandidate", ConsistentRead=True)
    items = table['Items']

    idx = 0
    for item in items:
        for key in item:
            value = list(item[key].values())[0]
            # added this line to write and replace the by the new formatted object
            dynamodb.put_item(TableName="PresidentialCandidate", Item=item)   
            items[idx][key] = value
        idx += 1
    return items