The following is a complete list of Python standard libraries
text
string: general string operations
re: regular expression operations
difflib: difference calculation tool
textwrap: text padding
unicodedata: Unicode character database
stringprep: Internet string preparation tool
readline: GNU read interface by line
rlcompleter: the implementation function of GNU reading by line
binary data
struct: parse bytes into packed binary data
codecs: registry and base class codecs
type of data
datetime: based on date and time tools
calendar: general month function
collections: container data type
collections.abc: container virtual base class
heapq: heap queue algorithm
bisect: array binary algorithm
array: Efficient numeric array
weakref: weak reference
types: dynamic creation and naming of built-in types
copy: shallow copy and deep copy
pprint: formatted output
reprlib: implementation of alternate repr()
math
numbers: Virtual base class for numeric values
math: mathematical function
cmath: Mathematical functions for complex numbers
decimal: fixed-point and floating-point calculations
fractions: rational numbers
random: generate pseudo-random numbers
functional programming
itertools: generate iterators for efficient loops
functools: higher-order functions and operations on callable objects
operator: standard operation for the function
Files and Directories
os.path: Generic pathname control
fileinput: iterate over lines from multiple input streams
stat: Interpret the results of stat()
filecmp: comparison function for files and directories
tempfile: generate temporary files and directories
glob: an extension to the Unix-style pathname format
fnmatch: Unix-style pathname format comparison
linecache: random storage of text lines
shutil: advanced file operations
macpath: MacOS 9 path control functions
Persistence
pickle: Python object serialization
copyreg: registration machine support function for pickle
shelve: Python object persistence
marshal: internal Python object serialization
dbm: Unix "database" interface
sqlite3: API2.0 for SQLite database
compression
zlib: gzip-compatible compression
gzip: support for gzip files
bz2: support for bzip2 compression
lzma: Compression using the LZMA algorithm
zipfile: Manipulate ZIP archives
tarfile: read and write tar archive files
file format
csv: Read and write CSV files
configparser: configuration file parser
netrc: netrc file handler
xdrlib: XDR data encoding and decoding
plistlib: generate and parse Mac OS X .plist files
encryption
hashlib: secure hashing and message digests
hmac: keyed hash for message authentication
operating system tools
os: multifaceted operating system interface
io: stream core tools
time: query and conversion of time
argparser: parser for command line options, arguments and subcommands
optparser: command line option parser
getopt: C-style command-line option parser
logging: Python logging tool
logging.config: log configuration
logging.handlers: log handlers
getpass: simple password input
curses: terminal handling for character display
curses.textpad: text input field for the curses program
curses.ascii: ASCII character set tools
curses.panel: curses control stack extension
platform: access the underlying platform authentication data
errno: standard error notation
ctypes: Python foreign function library
concurrency
threading: thread-based parallelism
multiprocessing: process-based parallelism
concurrent: concurrent package
concurrent.futures: start parallel tasks
subprocess: subprocess management
sched: event scheduling
queue: Synchronization queue
select: wait for I/O to complete
dummy_threading: an alternative to the threading module (when _thread is not available)
_thread: The underlying thread API (threading is based on it)
_dummy_thread: an alternative to the _thread module (when _thread is not available)
interprocess communication
socket: the underlying network interface
ssl: TLS/SSL shim for socket objects
asyncore: Asynchronous socket processor
asynchat: Asynchronous socket command/response handler
signal: asynchronous transaction signal handler
mmap: memory-mapped file support
the Internet
email: mail and MIME processing package
json: JSON encoding and decoding
mailcap: mailcap file processing
mailbox: Multiple format control mailboxes
mimetypes: file name and MIME type mapping
base64：RFC
3548: Base16, Base32, Base64 encoding
binhex: binhex4 file encoding and decoding
binascii: conversion between binary code and ASCII code
quopri：MIME
quoted - Encoding and decoding of printable data
uu: encoding and decoding of uuencode files
HTML and XML
html: HTML support
html.parser: Simple HTML and XHTML parser
html.entities: Definition of HTML common entities
xml: XML processing module
xml.etree.ElementTree: tree XML element API
xml.dom：XML DOM API
xml.dom.minidom: XML DOM minimum spanning tree
xml.dom.pulldom: support for building partial DOM trees
xml.sax: support for SAX2 parsing
xml.sax.handler: SAX processor base class
xml.sax.saxutils: SAX tools
xml.sax.xmlreader: SAX parser interface
xml.parsers.expat: use Expat to quickly parse XML
Internet Protocols and Support
webbrowser: Simple web browser controller
cgi: CGI support
cgitb: CGI script backtracking manager
wsgiref: WSGI tool and reference implementation
urllib: URL processing module
urllib.request: an extension library for opening URL connections
urllib.response: the response class of the urllib module
urllib.parse: Parses URLs into components
urllib.error: exception class raised by urllib.request
urllib.robotparser: parser for robots.txt
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: RFC4122 UUID object
socketserver: web server framework
http.server: HTTP server
http.cookies: HTTP Cookie state manager
http.cookiejar: HTTP client cookie handling
xmlrpc: XML - RPC server and client module
xmlrpc.client: XML - RPC client access
xmlrpc.server: XML-RPC Server Basics
ipaddress: IPv4/IPv6 control library
multimedia
audioop: processing raw audio data
aifc: Read and write AIFF and AIFC files
sunau: Read and write Sun AU files
wave: read and write WAV files
chunk: read IFF large files
colorsys: conversion between color systems
imghdr: Specifies the image type
sndhdr: Specifies the sound file type
ossaudiodev: Access OSS compatible audio devices
globalization
gettext: multilingual internationalization service
locale: internationalization service
programming framework
turtle: Turtle graphics library
cmd: line-based command interpreter support
shlex: simple dictionary analysis
Tk graphical user interface
tkinter: Tcl/Tk interface
tkinter.ttk: Tk themed controls
tkinter.tix: Tk extension controls
tkinter.scrolledtext: Scroll text control
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 testing package
test.support: Python test toolkit
venv: virtual environment construction
debugging
bdb: Debug framework
faulthandler: Python backtracking library
pdb: Python debugger
timeit: small piece of code execution time measurement
trace: Python execution state tracking
Runtime
sys: system-related parameters and functions
sysconfig: Access Python configuration information
builtins: built-in objects
main: the top-level scripting environment
warnings: warning control
contextlib: contextual tools for with states
abc: virtual base class
atexit: exit handler
traceback: print or read a backtrace of the stack
future: future state definition
gc: garbage collection interface
inspect: inspect live objects
site: site-related configuration hook (hook)
fpectl: floating-point exception control
distutils: Generate and install Python modules
interpreter
code: base class interpreter
codeop: Compile Python code
import module
imp: access the internals of the import module
zipimport: Import modules from ZIP archives
pkgutil: package extension tool
modulefinder: find modules by script
runpy: Locate and execute Python modules
importlib: an implementation of import
Python language
parser: Access the Python parse tree
ast: abstract syntax tree
symtable: access compiler symbol table
symbol: a constant in the Python parse tree
token: a constant in the Python parse tree
keyword: Python keyword test
tokenize: Python source file word segmentation
tabnany: fuzzy indentation detection
pyclbr: Python class browsing support
py_compile: Compile Python source files
compileall: Compile Python libraries byte-wise
dis: disassembler for Python bytecode
pickletools: serialization development tools
other
formatter: general formatted output
Windows-related
msilib: Read and write Windows Installer files
msvcrt: Useful programs for MS VC++ Runtime
winreg: Windows registry access
winsound: Windows sound playback interface
Unix related
posix: the most commonly used POSIX calls
pwd: password database
spwd: shadow password database
grp: group database
crypt: Unix password authentication
termios: POSIX-style tty control
tty: terminal control function
pty: pseudo terminal tool
fcntl: system calls fcntl() and ioctl()
pipes: shell pipeline interface
resource: Resource availability information
nis: Sun's NIS interface
syslog: Unix logging service