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from pydantic import BaseModel

class FooBarModel(BaseModel):

a: str

b: dict

class Config:

allow_mutation = False

foobar = FooBarModel(a="hello", b={"apple": "pear"})

try:

foobar.a = "different"

except TypeError as e:

print(e)

print(foobar.a)

print(foobar.b)

foobar.b["apple"] = "grape"

print(foobar.b) # grape