把 b中的字段整合到a上

a = [{"id": 1, "data": 1}, {"id": 2, "data": 1}, {"id": 3, "data": 1}, {"id": 4, "data": 1}]

b = [{"id": 1, "key": 1}, {"id": 2, "key": 2}, {"id": 3, "key": 3}, {"id": 4, "key": 4}]

count = 0
for i in a:
for j in b:
count += 1
if i["id"] == j["id"]:
i["key"] = j["key"]

下面可以实现