AWS Lambda JSON到DynamoDB KeyError序列化JSON

我在AWS上設置了我的lambda函數，並希望將我的JSON插入到DynamoDB（NoSQL）中。我認爲它與JSON（decimal_serializer）的序列化有關，但我可能是錯的。感謝幫助！AWS Lambda JSON到DynamoDB KeyError序列化JSON

錯誤味精：

在序列化這個數據我獲得以下錯誤

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

JSON數據到INSERT：

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

lambda函數處理程序

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輸出日誌錯誤（詳細信息）：

During handling of the above exception, another exception occurred: 
 
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 
 
09:23:38 
return json.dumps(obj, default=decimal_serializer) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/__init__.py", line 238, in dumps 
 
09:23:38 
**kw).encode(obj) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/encoder.py", line 199, in encode 
 
09:23:38 
chunks = self.iterencode(o, _one_shot=True) 
 
09:23:38 
File "/var/lang/lib/python3.6/json/encoder.py", line 257, in iterencode 
 
09:23:38 
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

來源

2017-05-30 zer02

從錯誤信息中可以看出''客戶'之一的'male_confidence'缺失。（沒有雙關語意）。你可以在lambda處理程序中打印'event'，以便查看'event'包含的數據嗎？輸出將在cloudwatch日誌中。 – nightgaunt

'{'device_id'：'abc876'，'recorded_at'：'1496136878'，'customers'：[{'male_confidence'：'0.2'，'female_confidence'：'0.8'}，{'male_confidence：'：'0.1 '，'female_confidence'：'0.9'}]}'，但是如果我在循環中輸出'print（customer）'，它會返回下面的'dict''。 – zer02

我在循環中打印了'customer ['male_confidence']'，它返回了'0.2'，第二個循環打破了上面的錯誤。 – zer02

錯字：

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

「male_confidence：」

來源

2017-05-30 13:04:20

非常感謝！我瘋了'：'。 – zer02

你有一個錯字male_confidence:，後注意額外的:。試試這個

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

來源

2017-05-30 13:06:31 Raf

AWS Lambda JSON到DynamoDB KeyError序列化JSON

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