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 | Access system-specific parameters and functions. |
| gc | Interface to the cycle-detecting garbage collector. |
| weakref | Support for weak references and weak dictionaries. |
| fpectl | Provide control for floating point exception handling. |
| atexit | Register and execute cleanup functions. |
| types | Names for all built-in types. |
| UserDict | Class wrapper for dictionary objects. |
| UserList | Class wrapper for list objects. |
| UserString | Class wrapper for string objects. |
| operator | All Python's standard operators as built-in functions. |
| inspect | Extract information and source code from live objects. |
| traceback | Print or retrieve a stack traceback. |
| linecache | This module provides random access to individual lines from text files. |
| pickle | Convert Python objects to streams of bytes and back. |
| cPickle | Faster version of pickle, but not subclassable. |
| copy_reg | Register pickle support functions. |
| shelve | Python object persistence. |
| copy | Shallow and deep copy operations. |
| marshal | Convert Python objects to streams of bytes and back (with different constraints). |
| warnings | Issue warning messages and control their disposition. |
| imp | Access the implementation of the import statement. |
| code | Base classes for interactive Python interpreters. |
| codeop | Compile (possibly incomplete) Python code. |
| pprint | Data pretty printer. |
| repr | Alternate repr() implementation with size limits. |
| new | Interface to the creation of runtime implementation objects. |
| site | A standard way to reference site-specific modules. |
| user | A standard way to reference user-specific modules. |
| __builtin__ | The set of built-in functions. |
| __main__ | The environment where the top-level script is run. |