Can I make a default value in pydantic if None is passed in the field without using validators?

Question

Can I make a default value in pydantic if None is passed in the field without using validators?

I have the following code, but it seems to me that the validator here is superfluous for contract_ndfl. Is there any way to do without a validator?

My code:

  class User(BaseModel):
        user: int
        s_name: str
        contract_ndfl: Optional[int]
        

       @validator('contract_ndfl')
       def set_contract_ndfl(cls, v):
           return v or 13

Wishful code:

class User(BaseModel):
      user: int
      s_name: str
      contract_ndfl: Optional[int] = 13