
Python Runtime Services
***********************

The modules described in this chapter provide a wide range of services
related to the Python interpreter and its interaction with its
environment.  Here's an overview:

* ``sys`` --- System-specific parameters and functions
* ``__builtin__`` --- Built-in objects
* ``future_builtins`` --- Python 3 built-ins
* ``__main__`` --- Top-level script environment
* ``warnings`` --- Warning control
  * Warning Categories
  * The Warnings Filter
  * Temporarily Suppressing Warnings
  * Testing Warnings
  * Available Functions
  * Available Context Managers
* ``contextlib`` --- Utilities for ``with``-statement contexts
* ``abc`` --- Abstract Base Classes
* ``atexit`` --- Exit handlers
  * ``atexit`` Example
* ``traceback`` --- Print or retrieve a stack traceback
  * Traceback Examples
* ``__future__`` --- Future statement definitions
* ``gc`` --- Garbage Collector interface
* ``inspect`` --- Inspect live objects
  * Types and members
  * Retrieving source code
  * Classes and functions
  * The interpreter stack
* ``site`` --- Site-specific configuration hook
* ``user`` --- User-specific configuration hook
* ``fpectl`` --- Floating point exception control
  * Example
  * Limitations and other considerations