AWS Lambda JSONからDynamoDB KeyError JSONをシリアライズ

Question

AWSでラムダ関数を設定していて、JSONをDynamoDB（NoSQL）に挿入したいとします。 JSON（decimal_serializer）のシリアライズと関係があると思いますが、間違っている可能性があります。手伝ってくれてありがとう！

このデータをシリアライズしながら、私はエラーを次取得：

エラーMSG：

{ 
    "errorMessage": "'male_confidence'", 
    "errorType": "KeyError" 
} 

JSONデータを挿入する：

{ 
    "device_id": "abc876", 
    "recorded_at": "1496136878", 
    "customers": [ 
    { 
     "male_confidence": "0.2", 
     "female_confidence": "0.8" 
    }, 
    { 
     "male_confidence:": "0.1", 
     "female_confidence": "0.9" 
    } 
    ] 
} 

ラムダ関数ハンドラ

を

import boto3 
import json 

def lambda_handler(event, context): 
    # TODO implement 
    client = boto3.client('dynamodb') 
    for customer in event['customers']: 
     client.put_item(TableName="cv_data_1", Item={'device_id': {"S": event['device_id']}, 'male_confindence': {"N": customer['male_confidence']}, 'female_confidence': {"N": customer['female_confidence']}, "timestamp":{ "N": event['recorded_at']}}) 
    print('Successfully processed %s items.' % str(len(event['customers']))) 

AWS出力ログ・エラー（詳細）：

During handling of the above exception, another exception occurred: 
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09:23:38 
Traceback (most recent call last): 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 463, in <module> 
 
09:23:38 
main() 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 459, in main 
 
09:23:38 
handle_event_request(request_handler, invokeid, event_body, context_objs, invoked_function_arn) 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 240, in handle_event_request 
 
09:23:38 
result = to_json(result) 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 215, in to_json 
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return json.dumps(obj, default=decimal_serializer) 
 
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File "/var/lang/lib/python3.6/json/__init__.py", line 238, in dumps 
 
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**kw).encode(obj) 
 
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File "/var/lang/lib/python3.6/json/encoder.py", line 199, in encode 
 
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chunks = self.iterencode(o, _one_shot=True) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/encoder.py", line 257, in iterencode 
 
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return _iterencode(o, 0) 
 
09:23:38 
File "/var/runtime/awslambda/bootstrap.py", line 104, in decimal_serializer 
 
09:23:38 
raise TypeError(repr(o) + " is not JSON serializable") 
 
09:23:38 
TypeError: <FrameSummary file /var/task/lambda_function.py, line 8 in lambda_handler> is not JSON serializable 

Answer 1

タイプミス：

"male_confidence:": "0.1", 
    "female_confidence": "0.9" 

"male_confidence："

Answer 2

あなたはmale_confidence:後にタイプミスがあり、ノート余分な:。試してみてください

{ 
    "device_id": "abc876", 
    "recorded_at": "1496136878", 
    "customers": [ 
    { 
     "male_confidence": "0.2", 
     "female_confidence": "0.8" 
    }, 
    { 
     "male_confidence": "0.1", 
     "female_confidence": "0.9" 
    } 
    ] 
}