Nested Pydantic Model from Dict

Quick notes on how to instantiate a pydantic.BaseModel from a python Dictionary:
from pydantic import BaseModel
from typing import Dict,List
class A(BaseModel):
key: str
value: str
class B(BaseModel):
id_: str
a_list: Dict[str, List[A]]
x = {"id_": "asd", "a_list": {"dbz": [{"key": "goku", "value": "gohan"}]}}
b = B(**x)
print(b)
print(b.a_list)
print(b.a_list["dbz"][0].key)
print(b.a_list["dbz"][0].value)
# id_='asd' a_list={'dbz': [A(key='goku', value='gohan')]}
# {'dbz': [A(key='goku', value='gohan')]}
# goku
# gohan
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