Add special type hinting for __hash__ to declare class as unhashable (#110)

Author: TheTripleV

pybind11_stubgen/__init__.py

@@ -479,6 +479,10 @@ def is_safe_to_use_repr(self, value):
         return False
 
     def to_lines(self):  # type: () -> List[str]
+        # special case for __hash__ to mark the surrounding class as unhashable
+        if self.name == "__hash__" and self.attr is None:
+            return ["__hash__: typing.ClassVar[None] = None"]
+
         if self.is_safe_to_use_repr(self.attr):
             return ["{name} = {repr}".format(name=self.name, repr=repr(self.attr))]
 

tests/stubs/expected/cpp_library_bindings/_core/opaque_types/__init__.pyi

@@ -118,7 +118,7 @@ class VectorPairStringDouble:
         """
         Remove the first item from the list whose value is x. It is an error if there is no such item.
         """
-    __hash__ = None
+    __hash__: typing.ClassVar[None] = None
     pass
 
 def get_complex_map() -> MapStringComplex: