Add __hash__ operator to Color class (#4455)

* add __hash__ operator to Color

* add changes file

* fix code style

* add type annotation

* Update changes/4455-czaki.md

Co-authored-by: Hasan Ramezani <hasan.r67@gmail.com>

Co-authored-by: Hasan Ramezani <hasan.r67@gmail.com>

changes/4455-czaki.md

@@ -0,0 +1 @@
+bugfix: Add `__hash__` method to `pydancic.color.Color` class.

pydantic/color.py

@@ -201,6 +201,9 @@ def __repr_args__(self) -> 'ReprArgs':
     def __eq__(self, other: Any) -> bool:
         return isinstance(other, Color) and self.as_rgb_tuple() == other.as_rgb_tuple()
 
+    def __hash__(self) -> int:
+        return hash(self.as_rgb_tuple())
+
 
 def parse_tuple(value: Tuple[Any, ...]) -> RGBA:
     """

tests/test_color.py

@@ -193,3 +193,9 @@ def test_eq():
 
     assert Color('red') == Color((255, 0, 0))
     assert Color('red') != Color((0, 0, 255))
+
+
+def test_color_hashable():
+    assert hash(Color('red')) != hash(Color('blue'))
+    assert hash(Color('red')) == hash(Color((255, 0, 0)))
+    assert hash(Color('red')) != hash(Color((255, 0, 0, 0.5)))