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I have these classes:

from typing import List
from pydantic import BaseModel


class Payment(BaseModel):
    rut: str = None,
    worked_days: int = None,
    base_salary: int = None,
    gratification: int = None,
    liquid_salary: int = None


class RemunerationBook(BaseModel):
    payments: List[Payment] = []

After creating an object from RemunerationBook class, then creating the Payment and append it to the list.

lre = RemunerationBook()
payment = Payment()
lre.payments.append(payment)
print(lre)

I get this when printing:

payments=[Payment(rut=(None,), worked_days=(None,), base_salary=(None,), gratification=(None,), liquid_salary=None)]

Why every attribute is in a list, except the last one?

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2 Answers 2

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3 
liquid_salary: int = None,

because of a point:

data, is tuple with one element data is a expression (str, int, float,...)

python can not distinguish between x and x and can not understand if it is tuple or not, so use comma if you want tuple or if you don't want, remove all commas

one more point:

() data is not list, but tuple... tuple has one important difference with list: it is immutable like str

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4 Comments

"so use colon" no? Use nothing. Remove the commas.
@juanpa.arrivillaga oh yes I made a mistake because English is not my first language and distractions, apologies, I meant comma
and I'm not certain that he wants int or tuple, I try to explain both and leave the choice to him
Oh, I see, my bad, forgot that commas are not used here. Also, said list because after printing this in a json (via endpoint), I got a list, but I see now that this a tuple internally. Thanks.
2

further to @MoRe answer

class Payment(BaseModel):
    rut: str = None,
    worked_days: int = None,
    base_salary: int = None,
    gratification: int = None,
    liquid_salary: int = None

changing the last one to

class Payment(BaseModel):
    rut: str = None,
    worked_days: int = None,
    base_salary: int = None,
    gratification: int = None,
    liquid_salary: int = None,

yields all of them to be tuples

you don't need to add different fields with , in your models. This will suffice

class Payment(BaseModel):
    rut: str = None
    worked_days: int = None
    base_salary: int = None
    gratification: int = None
    liquid_salary: int = None
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1 Comment

yup - indeed. fixed.

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