fix: ClassTypeHint.bases now falls back to the types actual base classes if it is not a generic type

Author: NiklasRosenstein

.changelog/_unreleased.toml

@@ -0,0 +1,5 @@
+[[entries]]
+id = "a5578e7f-32ca-442e-b52a-e6a16c573c35"
+type = "fix"
+description = "`ClassTypeHint.bases` now falls back to the types actual base classes if it is not a generic type"
+author = "@NiklasRosenstein"

src/typeapi/typehint.py

@@ -269,7 +269,12 @@ def type(self) -> type:
 
     @property
     def bases(self) -> "Tuple[Any, ...]":
-        return get_type_hint_original_bases(self.type)
+        """
+        Return the bases of the classes' types. If the type is a generic, the bases of the generic's origin are
+        returned in their parameterized form (e.g. `Generic[T]` instead of `Generic` is returned).
+        """
+
+        return get_type_hint_original_bases(self.type) or self.type.__bases__
 
     def get_parameter_map(self) -> Dict[Any, Any]:
         if not self.args:

src/typeapi/typehint_test.py

@@ -50,7 +50,7 @@ def test__TypeHint__list_generic() -> None:
     assert str(hint.parameters) == "(~T,)"
     assert len(hint) == 0
     assert hint.type is list
-    assert hint.bases == ()
+    assert hint.bases == (object,)
 
 
 def test__TypeHint__list_templatized() -> None:
@@ -62,7 +62,7 @@ def test__TypeHint__list_templatized() -> None:
     assert str(hint.parameters) == "(~T,)"
     assert len(hint) == 1
     assert hint.type is list
-    assert hint.bases == ()
+    assert hint.bases == (object,)
 
 
 def test__TypeHint__list_specialized() -> None:
@@ -74,12 +74,12 @@ def test__TypeHint__list_specialized() -> None:
     assert hint.parameters == ()
     assert len(hint) == 1
     assert hint.type is list
-    assert hint.bases == ()
+    assert hint.bases == (object,)
 
     hint_0 = hint[0]
     assert isinstance(hint_0, ClassTypeHint)
     assert hint_0.type == int
-    assert hint_0.bases == ()
+    assert hint_0.bases == (object,)
 
 
 @mark.parametrize(
@@ -442,7 +442,7 @@ def test__TypeHint__native_tuple_type() -> None:
     assert hint.args == (Any,)
     assert hint.parameters == ()
     assert hint.repeated
-    assert hint.bases == ()
+    assert hint.bases == (object,)
 
     hint = TypeHint(Tuple[Any, ...])
     assert isinstance(hint, TupleTypeHint), hint
@@ -452,7 +452,7 @@ def test__TypeHint__native_tuple_type() -> None:
     assert hint.args == (Any,)
     assert hint.parameters == ()
     assert hint.repeated
-    assert hint.bases == ()
+    assert hint.bases == (object,)
 
 
 def test__TypeHint__empty_tuple() -> None: