🏷️ Make python linters happy

backend/backend/schemas/line.py

@@ -1,5 +1,4 @@
 from enum import StrEnum
-from typing import Self
 
 from pydantic import BaseModel
 
@@ -29,10 +28,11 @@ class TransportMode(StrEnum):
     # idfm_types.TransportMode.rail + idfm_types.TransportSubMode.railShuttle
     val = "val"
 
+    # Self return type replaced by "TransportMode" to fix following mypy error:
+    # Incompatible return value type (got "TransportMode", expected "Self")
+    # TODO: Is it the good fix ?
     @classmethod
-    def from_idfm_transport_mode(
-        cls, mode: IdfmTransportMode, sub_mode: IdfmTransportSubMode
-    ) -> Self:
+    def from_idfm_transport_mode(cls, mode: str, sub_mode: str) -> "TransportMode":
         if mode == IdfmTransportMode.rail:
             if sub_mode == IdfmTransportSubMode.regionalRail:
                 return cls.rail_ter
@@ -42,7 +42,7 @@ class TransportMode(StrEnum):
                 return cls.rail_transilien
             if sub_mode == IdfmTransportSubMode.railShuttle:
                 return cls.val
-        return TransportMode(mode)
+        return cls(mode)
 
 
 class Line(BaseModel):