Explore Python’s Essential Standard Library Modules for Every Developer

Text

string: General string operations

re: Regular expression operations

difflib: Difference calculation tools

textwrap: Text wrapping

unicodedata: Unicode character database

stringprep: Internet string preparation tools

readline: GNU line‑reading interface

rlcompleter: GNU line‑reading implementation functions

struct: Convert bytes to packed binary data

codecs: Registry and base class 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 bisection algorithm

array: Efficient numeric arrays

weakref: Weak references

types: Dynamic creation and naming of built‑in types

copy: Shallow and deep copying

pprint: Pretty‑print formatting

reprlib: Alternate repr() implementation

Mathematics

numbers: Abstract base class for numeric types

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

functools: Higher‑order functions and operations on callable objects

operator: Functional equivalents of operators

File and Directory

os.path: Generic pathname manipulation

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 for Python objects

marshal: Internal Python object serialization

dbm: Unix “database” interface

sqlite3: API 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: Work with ZIP archives

tarfile: Read and write tar archive files

Encryption

hashlib: Secure hashes and message digests

hmac: Keyed hashing for message authentication

Operating System Tools

os: Multifaceted 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 facility

logging.config: Logging configuration

logging.handlers: Logging handlers

getpass: Simple password input

curses: Terminal handling for character displays

curses.textpad: Text input fields for curses programs

curses.ascii: ASCII character set utilities

curses.panel: Panel stack extensions for curses

platform: Access underlying platform identification data

errno: Standard error numbers

ctypes: Python foreign function library

Concurrency

threading: Thread‑based parallelism

multiprocessing: Process‑based parallelism

concurrent: Concurrency package

concurrent.futures: Launch parallel tasks

subprocess: Subprocess management

sched: Event scheduling

queue: Synchronized queues

select: Wait for I/O completion

dummy_threading: Threading module alternative when _thread is unavailable

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

_dummy_thread: _thread module alternative when _thread is 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: Various mailbox format handling

mimetypes: Mapping filenames to MIME types

base64: RFC3548 Base16, Base32, Base64 encoding

binhex: binhex4 file encoding and decoding

binascii: Conversions between binary and ASCII

quopri: Quoted‑printable encoding and decoding

uu: uuencode file encoding and decoding