Note

This fork just removes the boto dependencies to help reduce the aws lambda package size

DynamoDB Json

DynamoDB json util to load and dump strings of Dynamodb json format to python object and vise-versa

Install

just use pip:

pip install dynamodb-json

Use

The dynamodb-json util works the same as json loads and dumps functions:

import time
import uuid
from datetime import datetime
from decimal import Decimal

from dynamodb_json import json_util as json

json_ = {"MyString": "a",
         "num": 4,
         "MyBool": False,
         "my_dict": {"my_date": datetime.utcnow()},
         "MyNone": None,
         "MyZero": 0,
         "myDecimal": Decimal("19.2"),  # converts Decimal to float, load it as float
         "myLong": long(1938475658493),
         "MyNestedDict": {
             "my_other_nested": {
                 "name": "John",
                 "surname": "Lennon",
                 "MyOtherNone": None,
                 "floaty": float(29.4),
                 "myList": [1, 3, 4, 5, 6, "This Is Sparta!"],
                 "mySet": {1, 3, 4, 5, 6},  # converts set to list, returns as list
                 "myUUID": uuid.uuid4(),  # converts uuid to string, loads it as string
                 "time": time.time()  # converts it to seconds python float, loads it as float
             }
         }
    }

dynamodb_json = json.dumps(json_)

# {
# "my_dict": {"M": {"my_date": {"S": "2017-04-22T14:41:35.780000"}}}, 
# "MyBool": {"BOOL": false}, "MyNone": {"NULL": true}, 
# "MyNestedDict": {
#   "M": {"my_other_nested": {
#       "M": {"myUUID": {"S": "2f4ad21e098f49b18e22ad209779048b"}, 
#             "surname": {"S": "Lennon"}, "name": {"S": "John"}, 
#             "mySet": {"L": [{"N": "1"}, {"N": "3"}, {"N": "4"}, {"N": "5"}, {"N": "6"}]}, 
#             "floaty": {"N": "29.4"}, "time": {"N": "1492872095.78"}, 
#             "myList": {"L": [{"N": "1"}, {"N": "3"}, {"N": "4"}, {"N": "5"}, {"N": "6"}, {"S": "This Is Sparta!"}]}, 
#             "MyOtherNone": {"NULL": true}}
#             }
#       }
#   }, 
# "myDecimal": {"N": "19.2"}, "num": {"N": "4"}, 
# "MyString": {"S": "a"}, 
# "myLong": {"N": "1938475658493"}, 
# "MyZero": {"N": "0"}
# }


json.loads(dynamodb_json)

# {'my_dict': {'my_date': datetime.datetime(2017, 4, 22, 14, 41, 35, 780000)}, 'MyBool': False, 'MyNone': None,
#  'MyNestedDict': {
#      'my_other_nested': {'myUUID': '2f4ad21e098f49b18e22ad209779048b', 
#                          'surname': 'Lennon', 'name': 'John',
#                          'mySet': [1, 3, 4, 5, 6], 
#                          'floaty': 29.4, 
#                          'time': 1492872095.78,
#                          'myList': [1, 3, 4, 5, 6, 'This Is Sparta!'], 
#                          'MyOtherNone': None
#                          }
#              }, 
#  'myDecimal': 19.2,
#  'num': 4, 
#  'MyString': 'a', 
#  'myLong': 1938475658493L, 
#  'MyZero': 0
# }