#Python's built-in modules

Python comes with many built-in modules, called standard library modules, which can be imported and used directly without additional installation.

This document was created in Python 3.13

TODO:The details link is empty and will be updated。

Module Name	Description	Details
string	Common string operations	View
re	Regular expression operations	View
difflib	Helpers for computing differences	View
textwrap	Text wrapping and filling	View
unicodedata	Unicode database	View
stringprep	Internet string preparation	View
readline	GNU readline interface	View
rlcompleter	Completion function for GNU readline	View
struct	Interpret bytes as packed binary data	View
codecs	Codec registry and base classes	View
datetime	Basic date and time types	View
zoneinfo	IANA time zone support	View
calendar	General calendar-related functions	View
collections	Container datatypes	View
collections.abc	Abstract base classes for containers	View
heapq	Heap queue algorithms	View
bisect	Array bisection algorithms	View
array	Efficient arrays of numeric values	View
weakref	Weak references	View
types	Dynamic type creation and built-in type names	View
copy	Shallow and deep copy operations	View
pprint	Pretty-print data	View
reprlib	Alternative repr() implementation	View
enum	Support for enumerations	View
graphlib	Functions for graph-like structures	View
numbers	Numeric abstract base classes	View
math	Mathematical functions	View
cmath	Math functions for complex numbers	View
decimal	Decimal fixed and floating point arithmetic	View
fractions	Rational numbers	View
random	Generate pseudo-random numbers	View
statistics	Mathematical statistics functions	View
itertools	Iterator building blocks	View
operator	Functional interface to operators	View
pathlib	Object-oriented filesystem paths	View
os.path	Common pathname manipulations	View
stat	Interpret results of stat()	View
filecmp	Compare files and directories	View
tempfile	Generate temporary files and directories	View
glob	Unix-style pathname pattern expansion	View
fnmatch	Unix filename pattern matching	View
linecache	Random access to text lines	View
shutil	High-level file operations	View
pickle	Object serialization	View
copyreg	Register pickle support functions	View
shelve	Persistent storage of Python objects	View
marshal	Internal object serialization	View
dbm	Unix "database" interface	View
sqlite3	SQLite DB-API 2.0 interface	View
zlib	Gzip-compatible compression	View
gzip	Support for gzip files	View
bz2	Support for bzip2 compression	View
lzma	Compression using the LZMA algorithm	View
zipfile	Work with ZIP archives	View
tarfile	Read and write tar archives	View
csv	CSV file reading and writing	View
configparser	Configuration file parser	View
tomllib	Parse TOML files	View
netrc	Netrc file handling	View
plistlib	Parse and create Apple .plist files	View
hashlib	Secure hashes and message digests	View
hmac	Keyed-hash message authentication	View
secrets	Secure random numbers for passwords	View
os	Miscellaneous operating system interfaces	View
io	Core tools for working with streams	View
time	Time access and conversions	View
logging	Logging facility	View
logging.config	Logging configuration	View
logging.handlers	Logging handlers	View
platform	Platform identification data	View
errno	Standard errno system symbols	View
ctypes	Foreign Function Interface	View
argparse	Command-line option and argument parser	View
optparse	Parser for command-line options (deprecated)	View
getpass	Portable password input	View
fileinput	Iterate over lines from multiple input streams	View
curses	Terminal handling for character-cell displays	View
curses.textpad	Text input widget for curses programs	View
curses.ascii	Tools for ASCII character handling	View
curses.panel	Panel extension for curses	View
threading	Thread-based parallelism	View
multiprocessing	Process-based parallelism	View
multiprocessing.shared_memory	Shared memory for multiprocessing	View
concurrent.futures	Launch parallel tasks	View
subprocess	Subprocess management	View
sched	Event scheduler	View
queue	Synchronized queue classes	View
contextvars	Context variables	View
_thread	Low-level threading API	View
asyncio	Asynchronous I/O	View
socket	Low-level networking interface	View
ssl	TLS/SSL wrapper for socket objects	View
select	Wait for I/O completion	View
selectors	High-level I/O multiplexing	View
signal	Set asynchronous event handlers	View
mmap	Memory-mapped file support	View
email	Email and MIME handling	View
json	JSON encoder and decoder	View
mailbox	Manipulate various mailbox formats	View
mimetypes	Map filenames to MIME types	View
base64	Base16, Base32, Base64, Base85 encoding	View
binascii	Convert binary data to/from ASCII	View
quopri	Encode and decode MIME printable data	View
html	HTML support	View
html.parser	Simple HTML and XHTML parser	View
html.entities	Definitions of HTML general entities	View
xml.etree.ElementTree	ElementTree XML API	View
xml.dom	Document Object Model API	View
xml.dom.minidom	Minimal DOM implementation	View
xml.dom.pulldom	Support for building partial DOM trees	View
xml.sax	SAX2 parser support	View
xml.sax.handler	Base classes for SAX handlers	View
xml.sax.saxutils	SAX utilities	View
xml.sax.xmlreader	Interfaces for XML parsers	View
xml.parsers.expat	Fast XML parsing using Expat	View
webbrowser	Convenient Web browser control	View
wsgiref	WSGI utilities and reference implementation	View
urllib	URL handling modules	View
urllib.request	Extensible library for opening URLs	View
urllib.response	Response class used by urllib	View
urllib.parse	URL parsing	View
urllib.error	Exceptions raised by urllib.request	View
urllib.robotparser	robots.txt parser	View
http	HTTP modules	View
http.client	HTTP protocol client	View
ftplib	FTP protocol client	View
poplib	POP3 protocol client	View
imaplib	IMAP4 protocol client	View
smtplib	SMTP protocol client	View
uuid	UUID objects (RFC 4122)	View
socketserver	Framework for network servers	View
http.server	HTTP server	View
http.cookies	HTTP state management	View
http.cookiejar	HTTP cookie handling for clients	View
xmlrpc	XMLRPC client and server modules	View
xmlrpc.client	XML-RPC client access	View
xmlrpc.server	Basic XML-RPC server	View
ipaddress	IPv4/IPv6 manipulation	View
wave	Read and write WAV files	View
colorsys	Color system conversions	View
gettext	Multilingual internationalization services	View
locale	Internationalization services	View
turtle	Turtle graphics	View
cmd	Line-oriented command interpreters	View
shlex	Simple lexical analysis	View
tkinter	Python interface to Tcl/Tk	View
tkinter.colorchooser	Color chooser dialog	View
tkinter.font	Tkinter font wrapper	View
tkinter.messagebox	Tkinter message dialogs	View
tkinter.scrolledtext	Scrolling text widget	View
tkinter.dnd	Drag and drop support	View
tkinter.ttk	Themed widgets for Tk	View
IDLE	Python editor and shell	View
typing	Type hints support	View
pydoc	Documentation generator and online help system	View
doctest	Test interactive Python examples	View
unittest	Unit testing framework	View
unittest.mock	Mock object library	View
test	Python regression test package	View
test.support	Test suite support tools	View
test.support.socket_helper	Socket testing tools	View
test.support.script_helper	Tools for running Python scripts in tests	View
test.support.bytecode_helper	Tools for testing bytecode generation	View
test.support.threading_helper	Tools for thread testing	View
test.support.os_helper	OS testing tools	View
test.support.import_helper	Import testing tools	View
test.support.warnings_helper	Warning testing tools	View
bdb	Debugger framework	View
faulthandler	Dump Python tracebacks	View
pdb	Python debugger	View
timeit	Measure execution time of small code snippets	View
trace	Trace program execution	View
tracemalloc	Track memory allocations	View
ensurepip	Bootstrapping pip installer	View
venv	Create virtual environments	View
zipapp	Manage executable Python ZIP archives	View
sys	System-specific parameters and functions	View
sys.monitoring	Monitor runtime events	View
sysconfig	Access Python configuration information	View
builtins	Built-in objects	View
main	Top-level script environment	View
warnings	Warning control	View
dataclasses	Data classes	View
contextlib	Context manager utilities	View
abc	Abstract base classes	View
atexit	Exit handlers	View
traceback	Print or retrieve stack traces	View
future	Future feature definitions	View
gc	Garbage collector interface	View
inspect	Inspect live objects	View
site	Site-specific configuration hook	View
code	Interpreter base classes	View
codeop	Compile Python code	View
zipimport	Import from ZIP archives	View
pkgutil	Package extension utilities	View
modulefinder	Find modules used by a script	View
runpy	Locate and run Python modules	View
importlib	Implementation of import	View
importlib.resources	Read/open package resources	View
importlib.resources.abc	Abstract base classes for resources	View
importlib.metadata	Access package metadata	View
ast	Abstract Syntax Trees	View
symtable	Access compiler symbol tables	View
token	Constants for tokenizing source code	View
keyword	Check for Python keywords	View
tokenize	Tokenizer for Python source code	View
tabnanny	Detect ambiguous indentation	View
pyclbr	Class browser support	View
py_compile	Compile Python source files	View
compileall	Byte-compile all Python libraries	View
dis	Disassembler for Python bytecode	View
pickletools	Developer tools for pickle	View
msvcrt	Useful routines from MS VC++ runtime	View
winreg	Windows registry access	View
winsound	Sound playing interface for Windows	View
posix	Common POSIX system calls	View
pwd	Password database	View
grp	Group database	View
termios	POSIX-style tty control	View
tty	Terminal control functions	View
pty	Pseudo-terminal utilities	View
fcntl	fcntl and ioctl system calls	View
resource	Resource usage information	View
syslog	Unix syslog library routines	View

Refer to Python official documentation.

Created in 5/15/2025

Updated in 5/15/2025

Python / API Help Manual / Built-in functions

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