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| Python 3.6.5 Documentation > Python Runtime Services
Python Runtime Services The modules described in this chapter provide a wide range of services * "sys" — System-specific parameters and functions * "sysconfig" — Provide access to Python’s configuration information * Configuration variables * Installation paths * Other functions * Using "sysconfig" as a script * "builtins" — Built-in objects * "__main__" — Top-level script environment * "warnings" — Warning control * Warning Categories * The Warnings Filter * Default Warning Filters * Temporarily Suppressing Warnings * Testing Warnings * Updating Code For New Versions of Python * Available Functions * Available Context Managers * "contextlib" — Utilities for "with"-statement contexts * Utilities * Examples and Recipes * Supporting a variable number of context managers * Simplifying support for single optional context managers * Catching exceptions from "__enter__" methods * Cleaning up in an "__enter__" implementation * Replacing any use of "try-finally" and flag variables * Using a context manager as a function decorator * Single use, reusable and reentrant context managers * Reentrant context managers * Reusable context managers * "abc" — Abstract Base Classes * "atexit" — Exit handlers * "atexit" Example * "traceback" — Print or retrieve a stack traceback * "TracebackException" Objects * "StackSummary" Objects * "FrameSummary" Objects * Traceback Examples * "__future__" — Future statement definitions * "gc" — Garbage Collector interface * "inspect" — Inspect live objects * Types and members * Retrieving source code * Introspecting callables with the Signature object * Classes and functions * The interpreter stack * Fetching attributes statically * Current State of Generators and Coroutines * Code Objects Bit Flags * Command Line Interface * "site" — Site-specific configuration hook * Readline configuration * Module contents * "fpectl" — Floating point exception control * Example * Limitations and other considerations |
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