Comprehensive Overview of Python Standard Library Modules

Implementation of 200 similar standard library categories with differences distinguished.

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Text

string: General string operations

re: Regular expression operations

difflib: Difference calculation tools

textwrap: Text filling

unicodedata: Unicode character database

stringprep: Internet string preparation utilities

readline: GNU line‑reading interface

rlcompleter: GNU line‑reading implementation functions

struct: Convert bytes to packed binary data

codecs: Registry and base classes for codecs

Data Types

datetime: Date and time utilities

calendar: General month functions

collections: Container data types

collections.abc: Abstract base classes for containers

heapq: Heap queue algorithm

bisect: Array binary search algorithm

array: Efficient numeric arrays

weakref: Weak references

types: Dynamic creation and naming of built‑in types

copy: Shallow and deep copy

reprlib: Alternate implementation of repr()

Mathematics

numbers: Abstract base class for numbers

math: Mathematical functions

cmath: Mathematical functions for complex numbers

decimal: Fixed‑point and floating‑point arithmetic

fractions: Rational numbers

random: Pseudo‑random number generation

Functional Programming

itertools: Efficient iterator building blocks for loops

functools: Higher‑order functions and operations on callables

operator: Standard operators as functions

Files and Directories

os.path: Generic pathname manipulations

fileinput: Iterate over lines from multiple input streams

stat: Interpret results of stat()

filecmp: File and directory comparison functions

tempfile: Generate temporary files and directories

glob: Unix‑style pathname pattern expansion

fnmatch: Unix‑style filename matching

linecache: Random access to text lines

shutil: High‑level file operations

macpath: MacOS 9 pathname control functions

Persistence

pickle: Python object serialization

copyreg: Support functions for pickle

shelve: Persistent storage of Python objects

marshal: Internal Python object serialization

dbm: Unix “database” interface

sqlite3: API 2.0 for SQLite databases

Compression

zlib: gzip‑compatible compression

gzip: Support for gzip files

bz2: Support for bzip2 compression

lzma: Compression using the LZMA algorithm

zipfile: Working with ZIP archives

tarfile: Reading and writing tar archive files

Encryption

hashlib: Secure hashes and message digests

hmac: Keyed hashing for message authentication

Operating System Tools

os: Multi‑faceted operating system interface

io: Core tools for streams

time: Time queries and conversions

argparser: Command‑line option, argument, and sub‑command parser

optparser: Command‑line option parser

getopt: C‑style command‑line option parser

logging: Python logging utilities

logging.config: Logging configuration

logging.handlers: Logging handlers

getpass: Simple password input

curses: Terminal handling for character displays

curses.textpad: Text input widget for curses programs

curses.ascii: ASCII character utilities

curses.panel: Panel extensions for curses

platform: Access underlying platform identification data

errno: Standard error numbers

ctypes: Foreign function library for Python

Concurrency

threading: Thread‑based parallelism

multiprocessing: Process‑based parallelism

concurrent: Concurrency package

concurrent.futures: Launch parallel tasks

subprocess: Subprocess management

sched: Event scheduling

queue: Synchronous queues

select: Wait for I/O completion

dummy_threading: Threading module substitute when _thread is unavailable

_thread: Low‑level thread API (threading builds on it)

_dummy_thread: Substitute for _thread when unavailable

Inter‑Process Communication

socket: Low‑level network interface

ssl: TLS/SSL wrapper for socket objects

asyncore: Asynchronous socket handler

asynchat: Asynchronous socket command/response handler

signal: Asynchronous signal handling

mmap: Memory‑mapped file support

Internet

email: Email and MIME handling package

json: JSON encoding and decoding

mailcap: Mailcap file handling

mailbox: Multiple format mailbox control

mimetypes: Mapping filenames to MIME types

base64: RFC 3548 Base16, Base32, Base64 encoding

binhex: Binhex4 file encoding and decoding

binascii: Binary‑ASCII conversions

quopri: MIME‑quoted printable encoding/decoding

uu: UUEncode file encoding/decoding

Internet Protocols and Support

webbrowser: Simple web‑browser controller

cgi: CGI support

cgitb: CGI script traceback manager

wsgiref: WSGI utilities and reference implementation

urllib: URL handling modules

urllib.request: Extensions for opening URL connections

urllib.response: Response classes for urllib

urllib.parse: Parse URLs into components

urllib.error: Exception classes raised by urllib.request

urllib.robotparser: Robots.txt parser

http: HTTP module

http.client: HTTP protocol client

ftplib: FTP protocol client

poplib: POP protocol client

imaplib: IMAP4 protocol client

nntplib: NNTP protocol client

smtplib: SMTP protocol client

smtpd: SMTP server

telnetlib: Telnet client

uuid: UUID objects per RFC 4122

socketserver: Network server framework

http.server: HTTP server

http.cookies: HTTP cookie state manager

http.cookiejar: Cookie handling for HTTP clients

xmlrpc: XML‑RPC server and client modules

xmlrpc.client: XML‑RPC client access

xmlrpc.server: Basic XML‑RPC server

ipaddress: IPv4/IPv6 address manipulation library

Multimedia

audioop: Manipulate raw audio data

aifc: Read/write AIFF and AIFC files

sunau: Read/write Sun AU files

wave: Read/write WAV files

chunk: Read IFF chunked files

colorsys: Convert between color systems

imghdr: Determine image type

sndhdr: Determine sound file type

ossaudiodev: Access OSS‑compatible audio devices

Internationalization

gettext: Multilingual internationalization services

locale: Internationalization services

Programming Frameworks

turtle: Turtle graphics library

cmd: Line‑oriented command interpreter support

shlex: Simple lexical analysis

Tk GUI

tkinter: Tcl/Tk interface

tkinter.ttk: Tk themed widgets

tkinter.tix: Tk extended widgets

tkinter.scrolledtext: Scrolled‑text widget

Development Tools

pydoc: Documentation generator and online help system

doctest: Interactive Python examples

unittest: Unit testing framework

unittest.mock: Mock object library

test: Python regression test package

test.support: Python testing utilities

venv: Virtual environment creation

Debugging

bdb: Debugger framework

faulthandler: Python fault traceback

pdb: Python debugger

timeit: Measure execution time of small code snippets

trace: Trace Python execution

Runtime

sys: System‑specific parameters and functions

sysconfig: Access Python configuration information

builtins: Built‑in objects

main: Top‑level script environment

warnings: Warning control

contextlib: Context management utilities

abc: Abstract base classes

atexit: Exit handlers

traceback: Print or retrieve stack traces

future: Future statements

gc: Garbage collection interface

inspect: Inspect live objects

site: Site‑specific configuration hooks

fpectl: Floating‑point exception control

distutils: Build and install Python modules

Interpreter

code: Base class for interpreters

codeop: Compile Python code

Import Modules

imp: Access the internals of the import mechanism

zipimport: Import modules from ZIP archives

pkgutil: Package extension utilities

modulefinder: Find modules used by a script

runpy: Locate and run Python modules

importlib: Implementation of import

Python Language

parser: Access Python parse trees

ast: Abstract syntax trees

symtable: Access compiler symbol tables

symbol: Constants used by Python parse trees

token: Token constants used by Python parse trees

keyword: Keyword testing

tokenize: Tokenize Python source files

tabnanny: Indentation detection

pyclbr: Python class browsing support

py_compile: Compile Python source files

compileall: Byte‑compile Python libraries

dis: Disassembler for Python bytecode

pickletools: Tools for pickle development

Other

formatter: Generic output formatting

Windows‑related

msilib: Read/write Windows Installer files

msvcrt: Useful utilities from MS VC++ Runtime

winreg: Windows registry access

winsound: Windows sound playback interface

Unix‑related

posix: Common POSIX calls

pwd: Password database

spwd: Shadow password database

grp: Group database

crypt: Unix password verification

termios: POSIX‑style tty control

tty: Terminal control functions

pty: Pseudo‑terminal utilities

fcntl: System calls fcntl() and ioctl()

pipes: Shell pipe interface

resource: Resource usage information

nis: Sun NIS interface

syslog: Unix logging service