Add Vector.zero as a class-level constant

ppb · Jun 1, 2019 · 1eca758 · 1eca758
1 parent 304e0bd
commit 1eca758
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Showing 2 changed files with 11 additions and 0 deletions.
diff --git a/ppb_vector/__init__.py b/ppb_vector/__init__.py
@@ -60,6 +60,9 @@ class Vector:
     x: float
     y: float
 
+    # Class-level attributes
+    zero: typing.ClassVar['Vector']
+
     # Tell CPython that this isn't an extendable dict
     __slots__ = ('x', 'y', '__weakref__')
 
@@ -527,4 +530,7 @@ def reflect(self, surface_normal: VectorLike) -> 'Vector':
         return self - (2 * (self * surface_normal) * surface_normal)
 
 
+Vector.zero = Vector(0, 0)
+
+
 Sequence.register(Vector)
diff --git a/tests/test_zero.py b/tests/test_zero.py
@@ -0,0 +1,5 @@
+from ppb_vector import Vector
+
+
+def test_zero():
+    assert not Vector.zero