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 .. c:type:: PyClassObject 16 17 The C structure of the objects used to describe built-in classes. 18 19 20 .. c:var:: 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 .. c:function:: 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 .. c:function:: 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 .. c:var:: PyTypeObject PyInstance_Type 45 46 Type object for class instances. 47 48 49 .. c:function:: int PyInstance_Check(PyObject *obj) 50 51 Return true if *obj* is an instance. 52 53 54 .. c:function:: 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 .. c:function:: 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:`~object.__dict__`; if *NULL*, a new dictionary will be created for the 65 instance. 66
