first pylint correction

backend/src/structs/preferences.py

@@ -1,12 +1,26 @@
-from pydantic import BaseModel
+"""Defines the Preferences used as input for trip generation."""
+
 from typing import Optional, Literal
+from pydantic import BaseModel
+
 
 class Preference(BaseModel) :
+    """
+    Type of preference.
+
+    Attributes:
+        type: what kind of landmark type.
+        score: how important that type is.
+    """
     type: Literal['sightseeing', 'nature', 'shopping', 'start', 'finish']
     score: int          # score could be from 1 to 5
 
+
 # Input for optimization
 class Preferences(BaseModel) :
+    """"
+    Full collection of preferences needed to generate a personalized trip.
+    """
     # Sightseeing / History & Culture (Musées, bâtiments historiques, opéras, églises)
     sightseeing : Preference