Code cleanup and improved typing

pyhgtmap/__init__.py

@@ -1,9 +1,12 @@
 from importlib.metadata import version
+from typing import List, Tuple
 
 __author__ = "Aurélien Grenotton (agrenott@gmail.com)"
 __version__ = version("pyhgtmap")
 __license__ = "GPLv2+"
 
+# Can't use __future__ annotations for type aliases: https://github.com/python/cpython/issues/95805
 # Some type aliases
-Polygon = list[tuple[float, float]]
-PolygonsList = list[Polygon]
+Polygon = List[Tuple[float, float]]
+PolygonsList = List[Polygon]
+BoudingBox = Tuple[float, float, float, float]

pyhgtmap/hgt/__init__.py

@@ -1,6 +1,9 @@
 from __future__ import annotations
 
-from typing import Callable, Iterable, Tuple
+from typing import TYPE_CHECKING, Callable, Iterable, Tuple
+
+if TYPE_CHECKING:
+    from pyhgtmap import BoudingBox
 
 # Coordinates transformation function prototype
 TransformFunType = Callable[
@@ -9,7 +12,7 @@
 ]
 
 
-def makeBBoxString(bbox: tuple[float, float, float, float]) -> str:
+def makeBBoxString(bbox: BoudingBox) -> str:
     return f"{{0:s}}lon{bbox[0]:.2f}_{bbox[2]:.2f}lat{bbox[1]:.2f}_{bbox[3]:.2f}"
 
 
@@ -19,7 +22,7 @@ def transformLonLats(
     maxLon: float,
     maxLat: float,
     transform: TransformFunType | None,
-) -> tuple[float, float, float, float]:
+) -> BoudingBox:
     if transform is None:
         return minLon, minLat, maxLon, maxLat
     else: