Get value only when calling get_item in Lambda Python
0
I am successfully getting an item from DynamoDB in a Lambda Pyton with Boto3. However, I am getting attribute: value. not just the value. Is there a way to invoke get_tem to get just the value?
Python Code: import json import boto3
def lambda_handler(event, context): dynamodb = boto3.resource('dynamodb', region_name = 'us-east-1') table = dynamodb.Table('D12Sites')
response = table.get_item(
Key={'SitesID': '1'},
ProjectionExpression='D12Website',
)
resp1 = response["Item"]
print(resp1)
#resp1 is: {'D12Website': 'http://site.live'} #Need just: 'http://site.live'
return {
'statusCode': 200,
'body': json.dumps(response["Item"]),
}
#{'D12Website': 'http://site.live'}
質問済み 2ヶ月前310ビュー
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4
Are you Expecting the value and ignore key(attribute)(Key: Value)?
Extract the value from the response
website_value = response.get("Item", {}).get("D12Website", None)
print(website_value)
回答済み 2ヶ月前
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AWS公式更新しました 1年前
Just to be sure.....First, thanks. Second: this works on the variable response, not call the database table again. Correct?
Yes, The Response Variable Holds the result of the get_item operation which already retrieves the item from dynamodb table, so by extracting value from the response variable you are not making another call to database