[Python] Can't define variable in pydantic init function

I want to define a BaseDomain model that inherits from pydantic BaseModel like below

class BaseDomain(BaseModel):

def __init__(self, **kwargs):
self.__exceptions = []

def add_error(self, exception: GeneralException):
self.__exceptions.append(exception)



but I get this error when I use Product model that inherits from BaseDomain

ValueError: "Product" object has no field "_BaseDomain__exceptions"

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