|
1 .. highlightlang:: c |
|
2 |
|
3 .. _classobjects: |
|
4 |
|
5 Class and Instance Objects |
|
6 -------------------------- |
|
7 |
|
8 .. index:: object: class |
|
9 |
|
10 Note that the class objects described here represent old-style classes, which |
|
11 will go away in Python 3. When creating new types for extension modules, you |
|
12 will want to work with type objects (section :ref:`typeobjects`). |
|
13 |
|
14 |
|
15 .. ctype:: PyClassObject |
|
16 |
|
17 The C structure of the objects used to describe built-in classes. |
|
18 |
|
19 |
|
20 .. cvar:: PyObject* PyClass_Type |
|
21 |
|
22 .. index:: single: ClassType (in module types) |
|
23 |
|
24 This is the type object for class objects; it is the same object as |
|
25 ``types.ClassType`` in the Python layer. |
|
26 |
|
27 |
|
28 .. cfunction:: int PyClass_Check(PyObject *o) |
|
29 |
|
30 Return true if the object *o* is a class object, including instances of types |
|
31 derived from the standard class object. Return false in all other cases. |
|
32 |
|
33 |
|
34 .. cfunction:: int PyClass_IsSubclass(PyObject *klass, PyObject *base) |
|
35 |
|
36 Return true if *klass* is a subclass of *base*. Return false in all other cases. |
|
37 |
|
38 |
|
39 .. index:: object: instance |
|
40 |
|
41 There are very few functions specific to instance objects. |
|
42 |
|
43 |
|
44 .. cvar:: PyTypeObject PyInstance_Type |
|
45 |
|
46 Type object for class instances. |
|
47 |
|
48 |
|
49 .. cfunction:: int PyInstance_Check(PyObject *obj) |
|
50 |
|
51 Return true if *obj* is an instance. |
|
52 |
|
53 |
|
54 .. cfunction:: PyObject* PyInstance_New(PyObject *class, PyObject *arg, PyObject *kw) |
|
55 |
|
56 Create a new instance of a specific class. The parameters *arg* and *kw* are |
|
57 used as the positional and keyword parameters to the object's constructor. |
|
58 |
|
59 |
|
60 .. cfunction:: PyObject* PyInstance_NewRaw(PyObject *class, PyObject *dict) |
|
61 |
|
62 Create a new instance of a specific class without calling its constructor. |
|
63 *class* is the class of new object. The *dict* parameter will be used as the |
|
64 object's :attr:`__dict__`; if *NULL*, a new dictionary will be created for the |
|
65 instance. |