
Concrete Objects Layer
**********************

The functions in this chapter are specific to certain Python object
types. Passing them an object of the wrong type is not a good idea; if
you receive an object from a Python program and you are not sure that
it has the right type, you must perform a type check first; for
example, to check that an object is a dictionary, use
``PyDict_Check``.  The chapter is structured like the "family tree" of
Python object types.

Warning: While the functions described in this chapter carefully check the
  type of the objects which are passed in, many of them do not check
  for *NULL* being passed instead of a valid object.  Allowing *NULL*
  to be passed in can cause memory access violations and immediate
  termination of the interpreter.


Fundamental Objects
===================

This section describes Python type objects and the singleton object
``None``.

* Type Objects
* The None Object

Numeric Objects
===============

* Plain Integer Objects
* Boolean Objects
* Long Integer Objects
* Floating Point Objects
* Complex Number Objects
  * Complex Numbers as C Structures
  * Complex Numbers as Python Objects

Sequence Objects
================

Generic operations on sequence objects were discussed in the previous
chapter; this section deals with the specific kinds of sequence
objects that are intrinsic to the Python language.

* Byte Array Objects
* String/Bytes Objects
* Unicode Objects and Codecs
  * Unicode Objects
  * Built-in Codecs
  * Methods and Slot Functions
* Buffer Objects
* Tuple Objects
* List Objects

Mapping Objects
===============

* Dictionary Objects

Other Objects
=============

* Class and Instance Objects
* Function Objects
* Method Objects
* File Objects
* Module Objects
* Iterator Objects
* Descriptor Objects
* Slice Objects
* Weak Reference Objects
* CObjects
* Cell Objects
* Generator Objects
* DateTime Objects
* Set Objects