Dynamodb Pretty Parser

Parses Dynamodb responses into a more usable format. Results are returned as a list of dictionaries with the attribute names being the key. Results are parsed recursively. One use is to return results directly to Appsync from a Lambda function. Parses all scalar types that Dynamo supports

• N (number scalar) - cast as integer or Decimal types

• S (string scalar) - stays string

• SS (string set scalar) - list of strings

• NS (number set scalar) - list of Decimal/integer

• L (list scalar) - list

• BOOL (boolean scalar) - boolean

• B (binary scalar) - string of base64

• BS (binary set scalar) - list of base64 strings

• NULL (null scalar) - None

• M (map scalar) - Dictionary

Responses are returned formated as:

[
  {"attributeOneName": {"S": "value1"}, "attributeTwoName": {"S": "value2"}},
  {"attributeOneName": {"S": "value1"}, "attributeTwoName": {"S": "value2"}}
]

Becomes

[
  {"attributeOneName": "value1", "attributeTwoName": "value2"},
  {"attributeOneName": "value1", "attributeTwoName": "value2"}
]

Where each dictionary in the top level array is a separate item.

from dynamodbPrettyParser import parseResults
import boto3

dynamodb = boto3.client('dynamodb')
response = dynamodb.query(
  TableName='mytable',
  KeyConditionExpression='my_attribute = :foo',
  ExpressionAttributeValues={':foo': 'bar'}
)

print(parseResults(response))