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Python

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Class and Instance Objects — Python v2.6.2 documentation

Class and Instance Objects¶

Note that the class objects described here represent old-style classes, which will go away in Python 3. When creating new types for extension modules, you will want to work with type objects (section Type Objects).

PyClassObject¶
The C structure of the objects used to describe built-in classes.
PyObject* PyClass_Type¶

This is the type object for class objects; it is the same object as types.ClassType in the Python layer.

int PyClass_Check(PyObject *o)¶
Return true if the object o is a class object, including instances of types derived from the standard class object. Return false in all other cases.
int PyClass_IsSubclass(PyObject *klass, PyObject *base)¶
Return true if klass is a subclass of base. Return false in all other cases.

There are very few functions specific to instance objects.

PyTypeObject PyInstance_Type¶
Type object for class instances.
int PyInstance_Check(PyObject *obj)¶
Return true if obj is an instance.
PyObject* PyInstance_New(PyObject *class, PyObject *arg, PyObject *kw)¶
Return value: New reference.

Create a new instance of a specific class. The parameters arg and kw are used as the positional and keyword parameters to the object’s constructor.

PyObject* PyInstance_NewRaw(PyObject *class, PyObject *dict)¶
Return value: New reference.

Create a new instance of a specific class without calling its constructor. class is the class of new object. The dict parameter will be used as the object’s __dict__; if NULL, a new dictionary will be created for the instance.

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