a way to find out data update according to primary key

compare_data_set.py

#!/usr/bin/env python

list1 = [
	{"id": 1, "name": "smile", "age": 23},
	{"id": 3, "name": "mary", "age": 40},
	{"id": 4, "name": "cherry", "age": 67}
]

list2 = [
	{"id": 1, "name": "smile", "age": 23},
	{"id": 3, "name": "Json", "age": 40},
	{"id": 4, "name": "cherry", "age": 67}
]


dict1 = { item["id"]: item for item in list1 }
dict2 = { item["id"]: item for item in list2 }

updates = { key: dict2[key] for key in dict2 if dict1[key] != dict2[key] }
ret = updates.values()


print dict1
print dict2
print ret