Add Position2D and Position3D of type NamedTuple

geojson_pydantic/types.py

@@ -1,6 +1,6 @@
 """Types for geojson_pydantic models"""
 
-from typing import List, Tuple, Union
+from typing import List, NamedTuple, Tuple, Union
 
 from pydantic import Field
 from typing_extensions import Annotated
@@ -10,7 +10,11 @@
     Tuple[float, float, float, float, float, float],  # 3D bbox
 ]
 
-Position = Union[Tuple[float, float], Tuple[float, float, float]]
+Position2D = NamedTuple("Position2D", [("longitude", float), ("latitude", float)])
+Position3D = NamedTuple(
+    "Position3D", [("longitude", float), ("latitude", float), ("altitude", float)]
+)
+Position = Union[Position2D, Position3D]
 
 # Coordinate arrays
 LineStringCoords = Annotated[List[Position], Field(min_length=2)]

tests/test_types.py

@@ -0,0 +1,50 @@
+import pytest
+
+from geojson_pydantic.types import Position2D, Position3D
+
+
+@pytest.mark.parametrize("coordinates", [(1, 2), (1.0, 2.0), (1.01, 2.01)])
+def test_position2d_valid_coordinates(coordinates):
+    """
+    Two number elements as coordinates should be okay
+    """
+    p = Position2D(longitude=coordinates[0], latitude=coordinates[1])
+    assert p[0] == coordinates[0]
+    assert p[1] == coordinates[1]
+    assert p.longitude == coordinates[0]
+    assert p.latitude == coordinates[1]
+    assert p == coordinates
+
+    p = Position2D(*coordinates)
+    assert p[0] == coordinates[0]
+    assert p[1] == coordinates[1]
+    assert p.longitude == coordinates[0]
+    assert p.latitude == coordinates[1]
+    assert p == coordinates
+
+
+@pytest.mark.parametrize(
+    "coordinates", [(1, 2, 3), (1.0, 2.0, 3.0), (1.01, 2.01, 3.01)]
+)
+def test_position3d_valid_coordinates(coordinates):
+    """
+    Three number elements as coordinates should be okay
+    """
+    p = Position3D(
+        longitude=coordinates[0], latitude=coordinates[1], altitude=coordinates[2]
+    )
+    assert p[0] == coordinates[0]
+    assert p[1] == coordinates[1]
+    assert p[2] == coordinates[2]
+    assert p.longitude == coordinates[0]
+    assert p.latitude == coordinates[1]
+    assert p.altitude == coordinates[2]
+    assert p == coordinates
+
+    p = Position3D(*coordinates)
+    assert p[0] == coordinates[0]
+    assert p[1] == coordinates[1]
+    assert p[2] == coordinates[2]
+    assert p.longitude == coordinates[0]
+    assert p.latitude == coordinates[1]
+    assert p.altitude == coordinates[2]