类型注解对象

提供几种用于类型提示的内置类型。 目前存在两种类型 — GenericAlias 和 Union。 只有 GenericAlias 会向 C 开放。

PyObject *Py_GenericAlias(PyObject *origin, PyObject *args)

Part of the Stable ABI since version 3.9.

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 NULL is returned.

下面是一个如何创建一个扩展类型泛型的例子:

 
 
 
 

  
  
  
  
...
  
  
  
  
static PyMethodDef my_obj_methods[] = {
  
  
  
  
 // Other methods.
  
  
  
  
 ...
  
  
  
  
 {"__class_getitem__", Py_GenericAlias, METH_O|METH_CLASS, "See PEP 585"}
  
  
  
  
 ...
  
  
  
  
}
 
 
 
 

参见

数据模型的方法 __class_getitem__() 。

3.9 新版功能.

PyTypeObject Py_GenericAliasType

Part of the Stable ABI since version 3.9.

由 Py_GenericAlias() 所返回的对象的 C 类型。等价于 Python 中的 types.GenericAlias 。

3.9 新版功能.

名称栏目：创新互联Python教程：类型注解对象
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