from typing import List
from pydantic import BaseModel

class Foo(BaseModel):
    count: int = ...
    size: float = None

class Bar(BaseModel):
    apple = 'x'
    banana = 'y'

class Spam(BaseModel):
    foo: Foo = ...
    bars: List[Bar] = ...


m = Spam(foo={'count': 4}, bars=[{'apple': 'x1'}, {'apple': 'x2'}])
print(m)
# > Spam foo=<Foo count=4 size=None> bars=[<Bar apple='x1' banana='y'>, <Bar apple='x2' banana='y'>]
print(m.values())
# {'foo': {'count': 4, 'size': None}, 'bars': [{'apple': 'x1', 'banana': 'y'}, {'apple': 'x2', 'banana': 'y'}]}