Objects for Type Hinting¶
Various built-in types for type hinting are provided. Only GenericAlias is exposed to C.
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PyObject* Py_GenericAlias(PyObject *origin, PyObject *args)¶
- Create a GenericAlias object. Equivalent to calling the Python class - types.GenericAlias. The origin and args arguments set the- GenericAlias’s- __origin__and- __args__attributes respectively. origin should be a- PyTypeObject*, and args can be a- PyTupleObject*or any- PyObject*. If args passed is not a tuple, a 1-tuple is automatically constructed and- __args__is set to- (args,). Minimal checking is done for the arguments, so the function will succeed even if origin is not a type. The- GenericAlias’s- __parameters__attribute is constructed lazily from- __args__. On failure, an exception is raised and- NULLis returned.- Here’s an example of how to make an extension type generic: - ... static PyMethodDef my_obj_methods[] = { // Other methods. ... {"__class_getitem__", (PyCFunction)Py_GenericAlias, METH_O|METH_CLASS, "See PEP 585"} ... } - See also - The data model method - __class_getitem__().- New in version 3.9. 
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PyTypeObject Py_GenericAliasType¶
- The C type of the object returned by - Py_GenericAlias(). Equivalent to- types.GenericAliasin Python.- New in version 3.9.