app/geolocalisation/class_geolocalisation.py

from pydantic import BaseModel, Field
from typing import Literal, List, Union, Optional

class Longitude(BaseModel):
    type: Literal['longitude']
    value: float

class Latitude(BaseModel):
    type: Literal['latitude']
    value: float

class Geolocalisation(BaseModel):
    longitude: Longitude
    latitude: Latitude
    name: Optional[str]