類型注解對象

提供幾種用于類型提示的內置類型。 目前存在兩種類型 — GenericAlias 和 Union。 只有 GenericAlias 會向 C 開放。

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.

下面是一個如何創(chuàng)建一個擴展類型泛型的例子:

 
 
 
 

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

參見

數(shù)據(jù)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() 所返回的對象的 C 類型。等價于 Python 中的 types.GenericAlias 。

3.9 新版功能.

分享題目：創(chuàng)新互聯(lián)Python教程：類型注解對象
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