| abc | abc allows to define abstract base classes. |
| aifc | PEP 594: Deprecated in 3.11 |
| argparse | process command line arguments |
| array | An array, in contrast to a list, contains elements that all have the same types. |
| ast | |
| asynchat | PEP 594: Deprecated in 3.6, replaced with asyncio |
| asyncio | create concurrent programs (async and await). Compare with concurrent.futures |
| asyncore | PEP 594: Deprecated in 3.6, replaced with asyncio |
| atexit | atexit provides a register function that is similar to C's oneexit(). |
| audioop | PEP 594: Deprecated in 3.11 |
| base64 | |
| bdb | |
| binascii | |
| binhex | |
| bisect | |
| builtins | |
| bz2 | |
| calendar | Functions that allow to output calendars like the unix shell cal command. This module is attributed as quick hack in PEP 594. |
| cgi | Deprecated since 3.11 (see PEP 594). |
| cgitb | PEP 594: Deprecated in 3.11 |
| chunk | PEP 594: Deprecated in 3.11 |
| cmath | Provides mathematical functions for complex numbers, compare with math. |
| cmd | |
| code | |
| codecs | |
| codeop | |
| collections | |
| collections.abc | collections.abc adds some useful abstract base classes such as Iterable, Container and MutableMapping. |
| colorsys | |
| compileall | |
| concurrent.futures | Compare with asyncio |
| configparser | |
| contextlib | Functionality that is used with and for context managers, for example the contextmanager decorator. |
| copy | |
| copyreg | |
| crypt | PEP 594: Deprecated in 3.11, replaced with legacycrypt, bcrypt, argon2-cffi, hashlib, passlib |
| csv | Read and write CSV files. |
| ctypes | call DLLs or shared libraries |
| curses | Note: there is no curses module for Windows. Use consolelib instead. |
| curses.ascii | |
| curses.panel | |
| curses.textpad | |
| datetime | Date and time calculations |
| dateutil | Provides extensions to datetime |
| dbm | A generic interface to the DBM database (which is able to store simple key/value pairs). Compare with shelve |
| decimal | Replacement for the float type when pricision is important, such as in financial applications. |
| difflib | |
| dis | disassembler for bytecode. |
| distutils | Tools to distribute Python modules. Compare with setuptools. See also PEP 517 |
| doctest | doctest finds code-examples in a module's docstring and executes them, typically for testing purposes. |
| _dummy_thread | |
| dummy_threading | |
| email | Manage email messages: MIME and RFC 2822 (See email.message) |
| ensurepip | |
| enum | |
| errno | |
| faulthandler | |
| fcntl | |
| filecmp | |
| fileinput | |
| fnmatch | |
| formatter | |
| fpectl | |
| fractions | Support for rational numbers. |
| ftplib | |
| functools | Used with and for callable objects |
| __future__ | a pseudo module that enables new language features that are not compatible with the current interpreter. |
| gc | control the garbage collector |
| getopt | |
| getpass | Gets a user's login name or prompts for entering a value without echoing it (typically used to enter passwords). |
| gettext | |
| glob | find filenames with wildcards. |
| grp | |
| gzip | |
| hashlib | |
| heapq | |
| hmac | |
| html | |
| html.entities | |
| html.parser | |
| http | Allows to create webservers. |
| http.client | |
| http.cookiejar | |
| http.cookies | |
| http.server | Is Python 2 SimpleHTTPServer merged into http.server in Python 3? |
| IDLE | |
| imaplib | |
| imghdr | PEP 594: Deprecated in 3.11, replaced with filetype, puremagic, python-magic |
| imp | |
| importlib | An interface to the instrinsics of the import statement. |
| inspect | |
| io | |
| ipaddress | |
| itertools | Iterator building blocks. |
| json | to parse JSON data. |
| keyword | |
| lib2to3 | Convert Python 2 scripts to Python 3 scripts. See also the 2to3.py script. |
| linecache | |
| locale | |
| logging | |
| logging.config | |
| logging.handlers | |
| lzma | |
| macpath | |
| mailbox | |
| mailcap | PEP 594: Deprecated in 3.11 |
| __main__ | |
| marshall | |
| math | Access the standard c library mathematical (floating point) routines, compare with cmath. |
| mimetypes | |
| mmap | |
| modulefinder | |
| msilib | PEP 594: Deprecated in 3.11 |
| msvcrt | |
| multiprocessing | |
| netrc | Parses files adhering to the netrc format (like ~/.netrc). |
| nis | PEP 594: Deprecated in 3.11 |
| nntplib | PEP 594: Deprecated in 3.11 |
| numbers | |
| operator | Exports efficient functions corresponding to Python's intrinsic operators. |
| optparse | Deprecated |
| os | |
| os.path | functions related to files and filename manipulation |
| ossaudiodev | PEP 594: Deprecated in 3.11 |
| parser | |
| pathlib | |
| pdb | a simple console-mode debugger |
| pickle | The pickle module allows to serialize arbitrarily complex objects. See also the dbm and shelve libraries. |
| pickletools | |
| pipes | PEP 594: Deprecated in 3.11, replaced with subprocess |
| pkgutil | |
| platform | |
| plistlib | |
| poplib | Compare with the smtplib and email modules |
| posix | |
| profile | |
| pprint | pretty printer, compare with the reprlib and textwrap modules |
| pstat | |
| pty | |
| pwd | |
| pyclbr | |
| py_compile | |
| pydoc | pydoc can create HTML from doc-strings that is located in a module's source code. (Compare with epydoc and Sphinx. |
| queue | |
| quopri | |
| random | Pseudo random number generator and selections. Compare with secrets. |
| re | for regular expressions. |
| readline | Input line editing etc., Apparently not availble on Windows. See also rlcompleter |
| reprlib | Compare with pprint |
| resource | |
| rlcompleter | See also readline. |
| runpy | |
| sched | |
| secrets | Generate random number for cryptographical use (passwords, authentication, security tokens etc.). Compare with the pseudo random number generators of random. |
| select | |
| selectors | |
| shelve | A dictionary-like which allows to persist any object that can also be handled by pickle. Compare with dbm |
| shlex | |
shutil | shutil contains high-level file operations. |
| signal | |
| site | |
| smtpd | PEP 594: Deprecated in 3.4.7/3.5.4, replaced with aiosmtpd |
| smtplib | compare with poplib and email modules |
| sndhdr | Determines type of a sound file. PEP 594: Deprecated in 3.11, replaced with filetype, puremagic, python-magic |
| socket | |
| socketserver | |
| spwd | PEP 594: Deprecated in 3.11, replaced with python-pam |
| sqlite3 | to access SQLite databases. |
| ssl | |
| stat | |
| statistics | calculate some basic statistical properties (mean, median, variance, etc.) |
| string | |
| stringprep | |
| struct | Read or write binary data. |
| subprocess | |
| sunau | |
| symbol | |
| symtable | |
| sys | to access system specifica. |
| sysconfig | |
| sysconfig | |
| syslog | |
| tabnanny | |
| tarfile | |
| telnetlib | PEP 594: Deprecated in 3.11, replaced with telnetlib3, Exscript` |
| tempfile | |
| termios | |
| test | |
| test.support | |
| textwrap | o wrap text and remove leading space from triple quoted strings. |
| _thread | |
| threading | Support for multi-threaded applications |
| time | |
| timeit | for precise code-execution-duration measurements. |
| tkinter | |
| tkinter.scrolledtext | |
| tkinter.tix | |
| tkinter.ttk | |
| token | |
| tokenize | |
| trace | |
| traceback | Extract, format and print stack traces. Compare with sys.last_traceback, sys.exc_info and sys._current_frames. |
| tracemalloc | |
| tty | |
| turtle | |
| types | |
| typing | Support for type hints (such as Any, Union, Callable, TypeVar and Generic), see also PEP 483 and 484 |
| unicodedata | |
| unittest | |
| unittest.mock | |
| unittest.mock | |
| urllib | |
| urllib.error | |
| urllib.parse | |
| urllib.request | |
| urllib.response | |
| urllib.robotparser | |
| uu | PEP 594: Deprecated in 3.11 |
| uuid | |
| venv | create virtual environments |
| warnings | |
| wave | Read and write .wav files. |
| weakref | weakref allows to point to object without incrementing their reference counter. |
| webbrowser | |
| winreg | |
| winsound | |
| wsgiref | The reference implementation for WSGI |
| xdrlib | PEP 594: Deprecated in 3.11 |
| XML | |
| xml.dom | |
| xml.dom.minidom | |
| xml.dom.pulldom | |
| xml.etree.ElementTree | |
| xml.parsers.expat | |
| xmlrpc | |
| xmlrpc.client, xmlrpc.server | remote procedure calls |
| xml.sax | |
| xml.sax.handler | |
| xml.sax.saxutils | |
| xml.sax.xmlreader | |
| zipapp | |
| zipfile | |
| zipimport | |
| zlib | data compression |