PyPy does not allow patching of non-heaptypes. We did that trick for simplicity in the signature module where we created a `__signature__` attribute for types. Type patching of `PyType_Type` needed a few things, only, because our types are already heaptypes. The plan was originally to also replace the type patching of * PyMethodDescr_Type * PyCFunction_Type * PyStaticMethod_Type * PyWrapperDescr_Type Actually, it is much easier to stop touching these types at all. Instead, we use the `get_signature` function in all test cases. [ChangeLog][shiboken6] Type patching of builtin types is not possible in PyPy. We use the `get_signature` function, instead for now. Task-number: PYSIDE-535 Change-Id: I0cb892872a3497ac1fcc67c913d05ba42d75014d Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>