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abc Abstract base classes according to PEP 3119.
anydbm Generic interface to DBM-style database modules.
array Space efficient arrays of uniformly typed numeric values.
ast Abstract Syntax Tree classes and manipulation.
atexit Register and execute cleanup functions.
audioop Manipulate raw audio data.
binascii Tools for converting between binary and various ASCII-encoded binary representations.
bz2 Interface to compression and decompression routines compatible with bzip2.
chunk Module to read IFF chunks.
cmath Mathematical functions for complex numbers.
code Facilities to implement read-eval-print loops.
codecs Encode and decode data and streams.
codeop Compile (possibly incomplete) Python code.
colorsys Conversion functions between RGB and other color systems.
copy Shallow and deep copy operations.
copy_reg Register pickle support functions.
cProfile Python profiler
crypt (Unix) The crypt() function used to check Unix passwords.
datetime Basic date and time types.
itertools Functions creating iterators for efficient looping.
dis Disassembler for Python bytecode.
posix (Unix) The most common POSIX system calls (normally used via module os).
os Miscellaneous operating system interfaces.
dumbdbm Portable implementation of the simple DBM interface.
dummy_thread Drop-in replacement for the thread module.
errno Standard errno system symbols.
exceptions Standard exception classes.
fcntl (Unix) The fcntl() and ioctl() system calls.
filecmp Compare files efficiently.
fileinput Loop over standard input or a list of files.
formatter Generic output formatter and device interface.
gdbm (Unix) GNU's reinterpretation of dbm.
getopt Portable parser for command line options; support both short and long option names.
getpass Portable reading of passwords and retrieval of the userid.
grp (Unix) The group database (getgrnam() and friends).
hmac Keyed-Hashing for Message Authentication (HMAC) implementation for Python.
htmlentitydefs Definitions of HTML general entities.
imghdr Determine the type of image contained in a file or byte stream.
imp Access the implementation of the import statement.
keyword Test whether a string is a keyword in Python.
linecache This module provides random access to individual lines from text files.
mailcap Mailcap file handling.
marshal Convert Python objects to streams of bytes and back (with different constraints).
nis (Unix) Interface to Sun's NIS (Yellow Pages) library.
operator Functions corresponding to the standard operators.
functools Higher order functions and operations on callable objects.
contextlib Utilities for with-statement contexts.
pwd (Unix) The password database (getpwnam() and friends).
py_compile Generate byte-code files from Python source files.
stat Utilities for interpreting the results of os.stat(), os.lstat() and os.fstat().
quopri Encode and decode files using the MIME quoted-printable encoding.
resource (Unix) An interface to provide resource usage information on the current process.
rlcompleter Python identifier completion, suitable for the GNU readline library.
signal Set handlers for asynchronous events.
sndhdr Determine type of a sound file.
spwd (Unix) The shadow password database (getspnam() and friends).
StringIO Read and write strings as if they were files.
sunau Provide an interface to the Sun AU sound format.
symbol Constants representing internal nodes of the parse tree.
symtable Interface to the compiler's internal symbol tables.
sys Access system-specific parameters and functions.
syslog (Unix) An interface to the Unix syslog library routines.
token Constants representing terminal nodes of the parse tree.
traceback Print or retrieve a stack traceback.
types Names for built-in types.
unicodedata Access the Unicode Database.
UserDict Class wrapper for dictionary objects.
uu Encode and decode files in uuencode format.
uuid UUID objects (universally unique identifiers) according to RFC 4122
warnings Issue warning messages and control their disposition.
weakref Support for weak references and weak dictionaries.
zlib Low-level interface to compression and decompression routines compatible with gzip.
time Time access and conversions.
gc Interface to the cycle-detecting garbage collector.
pstats Statistics object for use with the profiler.
re Regular expression operations.
bdb Debugger framework.
string Common string operations.
cmd Build line-oriented command interpreters.
fnmatch Unix shell style filename pattern matching.
glob Unix shell style pathname pattern expansion.
HTMLParser A simple parser that can handle HTML and XHTML.
platform Retrieves as much platform identifying data as possible.
textwrap Text wrapping and filling
math Mathematical functions (sin() etc.).
email Package supporting the parsing, manipulating, and generating email messages, including MIME documents.
importlib Convenience wrappers for __import__
hotshot High performance logging profiler, mostly written in C.
locale Internationalization services.
sysconfig Python's configuration information
pkgutil Utilities for the import system.
numbers Numeric abstract base classes (Complex, Real, Integral, etc.).
bisect Array bisection algorithms for binary searching.
cPickle Faster version of pickle, but not subclassable.
cStringIO Faster version of StringIO, but not subclassable.
difflib Helpers for computing differences between objects.
hashlib Secure hash and message digest algorithms.
imaplib IMAP4 protocol client (requires sockets).
aifc Read and write audio files in AIFF or AIFC format.
binhex Encode and decode files in binhex4 format.
compileall Tools for byte-compiling all Python source files in a directory tree.
gzip Interfaces for gzip compression and decompression using file objects.
argparse Command-line option and argument-parsing library.
ConfigParser Configuration file parser.
decimal Implementation of the General Decimal Arithmetic Specification.
collections High-performance datatypes.
modulefinder Find modules used by a script.
heapq Heap queue algorithm (a.k.a. priority queue).
netrc Loading of .netrc files.
pickle Convert Python objects to streams of bytes and back.
pickletools Contains extensive comments about the pickle protocols and pickle-machine opcodes, as well as some useful functions.
plistlib Generate and parse Mac OS X plist files.
pprint Data pretty printer.
random Generate pseudo-random numbers with various common distributions.
repr Alternate repr() implementation with size limits.
robotparser Loads a robots.txt file and answers questions about fetchability of other URLs.
sched General purpose event scheduler.
shelve Python object persistence.
shlex Simple lexical analysis for Unix shell-like languages.
struct Interpret strings as packed binary data.
tempfile Generate temporary files and directories.
UserList Class wrapper for list objects.
UserString Class wrapper for string objects.
webbrowser Easy-to-use controller for Web browsers.
whichdb Guess which DBM-style module created a given database.
xdrlib Encoders and decoders for the External Data Representation (XDR).
zipfile Read and write ZIP-format archive files.
dummy_threading Drop-in replacement for the threading module.
timeit Measure the execution time of small code snippets.
Cookie Support for HTTP state management (cookies).
cookielib Classes for automatic handling of HTTP cookies.
csv Write and read tabular data to and from delimited files.
pdb The Python debugger for interactive interpreters.
shutil High-level file operations, including copying.
tarfile Read and write tar-format archive files.
urllib2 Next generation URL opening library.
fractions Rational numbers.
pipes (Unix) A Python interface to Unix shell pipelines.
distutils Support for building and installing Python modules into an existing Python installation.
json Encode and decode the JSON format.
gettext Multilingual internationalization services.
lib2to3.__main__ the 2to3 library
logging Flexible event logging system for applications.
test Regression tests package containing the testing suite for Python.
unittest Unit testing framework for Python.
profile Python source profiler.
base64 RFC 3548: Base16, Base32, Base64 Data Encodings
wave Provide an interface to the WAV sound format.
urlparse Parse URLs into or assemble them from components.
Queue A synchronized queue class.
urllib Open an arbitrary network resource by URL (requires sockets).
SimpleXMLRPCServer Basic XML-RPC server implementation.
poplib POP3 protocol client (requires sockets).
ftplib FTP protocol client (requires sockets).
httplib HTTP and HTTPS protocol client (requires sockets).
mmap Interface to memory-mapped files for Unix and Windows.
runpy Locate and run Python modules without importing them first.
smtplib SMTP protocol client (requires sockets).
socket Low-level networking interface.
SocketServer A framework for network servers.
telnetlib Telnet client class.
zipimport support for importing Python modules from ZIP archives.
smtpd A SMTP server implementation in Python.
BaseHTTPServer Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer).
SimpleHTTPServer This module provides a basic request handler for HTTP servers.
cgi Helpers for running Python scripts via the Common Gateway Interface.
mimetypes Mapping of filename extensions to MIME types.
xmlrpclib XML-RPC client access.
CGIHTTPServer This module provides a request handler for HTTP servers which can run CGI scripts.
nntplib NNTP protocol client (requires sockets).
asynchat Support for asynchronous command/response protocols.
cgitb Configurable traceback handler for CGI scripts.
DocXMLRPCServer Self-documenting XML-RPC server implementation.
inspect Extract information and source code from live objects.
pyclbr Supports information extraction for a Python class browser.
tabnanny Tool for detecting white space related problems in Python source files in a directory tree.
tokenize Lexical scanner for Python source code.
trace Trace or track Python statement execution.
site A standard way to reference site-specific modules.
pydoc Documentation generator and online help system.
doctest Test pieces of code within docstrings.
calendar Functions for working with calendars, including some emulation of the Unix cal program.
mailbox Manipulate mailboxes in various formats
io Core tools for working with streams.
ctypes A foreign function library for Python.
parser Access parse trees for Python source code.
wsgiref.handlers WSGI Utilities and Reference Implementation.
ssl TLS/SSL wrapper for socket objects
Irrelevant without appropriate libraries
bsddb Interface to Berkeley DB database library
dbhash DBM-style interface to the BSD database library.
dbm (Unix) The standard "database" interface, based on ndbm.
sqlite3 A DB-API 2.0 implementation using SQLite 3.x.
ossaudiodev (Linux, FreeBSD) Access to OSS-compatible audio devices.
Lack of tcl support
ScrolledText (Tk) Text widget with a vertical scroll bar.
Tix Tk Extension Widgets for Tkinter
Tkinter Interface to Tcl/Tk for graphical user interfaces
ttk Tk themed widget set
turtle Turtle graphics for Tk
Lack of signal/terminal control support
fpectl (Unix) Provide control for floating point exception handling.
readline (Unix) GNU readline support for Python.
pty (Linux) Pseudo-Terminal Handling for Linux.
termios (Unix) POSIX style tty control.
tty (Unix) Utility functions that perform common terminal control operations.
asyncore A base class for developing asynchronous socket handling services.
curses (Unix) An interface to the curses library, providing portable terminal handling.
Lack of threading/process support
multiprocessing Process-based "threading" interface.
select Wait for I/O completion on multiple streams.
thread Create multiple threads of control within one interpreter.
threading Higher-level threading interface.
subprocess Subprocess management.
Lack of sockets
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