python的可用模块查看示例

这篇文章主要为大家详细介绍了python的可用模块查看示例，具有一定的参考价值，可以用来参考一下。

1.这种方式的问题是,只列出当前import进上下文的模块.

进入python命令行.输入以下代码:

$ python

Python 2.7.2 (default, Jan 19 2012, 18:26:31)

[GCC 4.1.2 20080704 (Red Hat 4.1.2-51)] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> import sys

>>> sys.modules

{'copy_reg': <module 'copy_reg' from '/usr/local/lib/python2.7/copy_reg.pyc'>, 'sre_compile': <module 'sre_compile' from '/usr/local/lib/python2.7/sre_compile.pyc'>, '_sre': <module '_sre' (built-in)>, 'encodings': <module 'encodings' from '/usr/local/lib/python2.7/encodings/__init__.pyc'>, 'site': <module 'site' from '/usr/local/lib/python2.7/site.pyc'>, '__builtin__': <module '__builtin__' (built-in)>, 'sysconfig': <module 'sysconfig' from '/usr/local/lib/python2.7/sysconfig.pyc'>, '__main__': <module '__main__' (built-in)>, 'encodings.encodings': None, 'abc': <module 'abc' from '/usr/local/lib/python2.7/abc.pyc'>, 'posixpath': <module 'posixpath' from '/usr/local/lib/python2.7/posixpath.pyc'>, '_weakrefset': <module '_weakrefset' from '/usr/local/lib/python2.7/_weakrefset.pyc'>, 'errno': <module 'errno' (built-in)>, 'encodings.codecs': None, 'sre_constants': <module 'sre_constants' from '/usr/local/lib/python2.7/sre_constants.pyc'>, 're': <module 're' from '/usr/local/lib/python2.7/re.pyc'>, '_abcoll': <module '_abcoll' from '/usr/local/lib/python2.7/_abcoll.pyc'>, 'types': <module 'types' from '/usr/local/lib/python2.7/types.pyc'>, '_codecs': <module '_codecs' (built-in)>, '_warnings': <module '_warnings' (built-in)>, 'genericpath': <module 'genericpath' from '/usr/local/lib/python2.7/genericpath.pyc'>, 'stat': <module 'stat' from '/usr/local/lib/python2.7/stat.pyc'>, 'zipimport': <module 'zipimport' (built-in)>, 'encodings.__builtin__': None, 'warnings': <module 'warnings' from '/usr/local/lib/python2.7/warnings.pyc'>, 'UserDict': <module 'UserDict' from '/usr/local/lib/python2.7/UserDict.pyc'>, 'encodings.utf_8': <module 'encodings.utf_8' from '/usr/local/lib/python2.7/encodings/utf_8.pyc'>, 'sys': <module 'sys' (built-in)>, 'codecs': <module 'codecs' from '/usr/local/lib/python2.7/codecs.pyc'>, 'readline': <module 'readline' from '/usr/local/lib/python2.7/lib-dynload/readline.so'>, 'os.path': <module 'posixpath' from '/usr/local/lib/python2.7/posixpath.pyc'>, 'signal': <module 'signal' (built-in)>, 'traceback': <module 'traceback' from '/usr/local/lib/python2.7/traceback.pyc'>, 'linecache': <module 'linecache' from '/usr/local/lib/python2.7/linecache.pyc'>, 'posix': <module 'posix' (built-in)>, 'encodings.aliases': <module 'encodings.aliases' from '/usr/local/lib/python2.7/encodings/aliases.pyc'>, 'exceptions': <module 'exceptions' (built-in)>, 'sre_parse': <module 'sre_parse' from '/usr/local/lib/python2.7/sre_parse.pyc'>, 'os': <module 'os' from '/usr/local/lib/python2.7/os.pyc'>, '_weakref': <module '_weakref' (built-in)>}

2.还可以在python命令行下获取在线帮助:

>>> help()

Welcome to Python 2.7! This is the online help utility.

If this is your first time using Python, you should definitely check out

the tutorial on the Internet at http://docs.python.org/tutorial/.

Enter the name of any module, keyword, or topic to get help on writing

Python programs and using Python modules. To quit this help utility and

return to the interpreter, just type "quit".

To get a list of available modules, keywords, or topics, type "modules",

"keywords", or "topics". Each module also comes with a one-line summary

of what it does; to list the modules whose summaries contain a given word

such as "spam", type "modules spam".

>>> modules

Please wait a moment while I gather a list of all available modules...

/usr/local/lib/python2.7/site-packages/nltk/app/__init__.py:30: UserWarning: nltk.app package not loaded (please install Tkinter library).

warnings.warn("nltk.app package not loaded "

/usr/local/lib/python2.7/site-packages/nltk/draw/__init__.py:16: UserWarning: nltk.draw package not loaded (please install Tkinter library).

warnings.warn("nltk.draw package not loaded "

/usr/local/lib/python2.7/site-packages/twisted/words/im/__init__.py:8: UserWarning: twisted.im will be undergoing a rewrite at some point in the future.

warnings.warn("twisted.im will be undergoing a rewrite at some point in the future.")

ArgImagePlugin _LWPCookieJar dumbdbm readability

BaseHTTPServer _MozillaCookieJar dummy_thread readline

Bastion __builtin__ dummy_threading redis

BdfFontFile __future__ easy_install repr

BeautifulSoup _abcoll email resource

BeautifulSoupTests _ast encodings rexec

BmpImagePlugin _bisect engine rfc822

BufrStubImagePlugin _codecs errno rlcompleter

CDROM _codecs_cn exceptions robotparser

CGIHTTPServer _codecs_hk ext runpy

Canvas _codecs_iso2022 fcntl sched

ConfigParser _codecs_jp filecmp scrapy

ContainerIO _codecs_kr fileinput scrapyd

Cookie _codecs_tw fnmatch select

Crypto _collections formatter server

CurImagePlugin _csv fpformat sets

DLFCN _ctypes fractions setuptools

DcxImagePlugin _ctypes_test ftplib sgmllib

Dialog _curses functools sha

DocXMLRPCServer _curses_panel future_builtins shelve

EpsImagePlugin _elementtree gc shlex

ExifTags _functools genericpath shutil

FileDialog _hashlib getopt signal

FitsStubImagePlugin _heapq getpass site

FixTk _hotshot gettext six

FliImagePlugin _imaging glob smtpd

FontFile _imagingcms grp smtplib

FpxImagePlugin _imagingft gzip sndhdr

GbrImagePlugin _imagingmath hashlib socket

GdImageFile _io heapq spwd

GifImagePlugin _json hmac sql

GimpGradientFile _locale hotshot sqlalchemy

GimpPaletteFile _lsprof htmlentitydefs sqlite3

GribStubImagePlugin _md5 htmllib sre

HTMLParser _multibytecodec httplib sre_compile

Hdf5StubImagePlugin _multiprocessing idlelib sre_constants

IN _mysql ihooks sre_parse

IcnsImagePlugin _mysql_exceptions imaplib ssl

IcoImagePlugin _pyio imghdr stat

ImImagePlugin _random imp statvfs

Image _sha importlib string

ImageChops _sha256 imputil stringold

ImageCms _sha512 inspect stringprep

ImageColor _socket io strop

ImageDraw _sre itertools struct

ImageDraw2 _ssl json subprocess

ImageEnhance _strptime keyword sunau

ImageFile _struct lib2to3 sunaudio

ImageFileIO _symtable linecache symbol

ImageFilter _testcapi linuxaudiodev symtable

ImageFont _threading_local locale sys

ImageGL _warnings logging sysconfig

ImageGrab _weakref lxml syslog

ImageMath _weakrefset macpath tabnanny

ImageMode _yappi macurl2path tarfile

ImageOps abc mailbox telnetlib

ImagePalette aifc mailcap tempfile

ImagePath antigravity markupbase termios

ImageQt anydbm marshal test

ImageSequence argparse math tests

ImageShow array mcrypt textwrap

ImageStat ast md5 this

ImageTk asynchat mhlib thread

ImageTransform asyncore mimetools threading

ImageWin atexit mimetypes thrift

ImtImagePlugin audiodev mimify time

IptcImagePlugin audioop mmap timeit

JpegImagePlugin base64 modulefinder tkColorChooser

McIdasImagePlugin bdb multifile tkCommonDialog

MicImagePlugin binascii multiprocessing tkFileDialog

MimeWriter binhex mutex tkFont

MpegImagePlugin bisect netrc tkMessageBox

MspImagePlugin bsddb new tkSimpleDialog

MySQLdb bz2file nis toaiff

OleFileIO cPickle nltk token

OpenSSL cProfile nntplib tokenize

PIL cStringIO ntpath tornado

PSDraw calendar nturl2path trace

PaletteFile cgi numbers traceback

PalmImagePlugin cgitb opcode transport

PcdImagePlugin chardet operator ttk

PcfFontFile chunk optparse tty

PcxImagePlugin cmath orm turtle

PdfImagePlugin cmd os twisted

PixarImagePlugin code os2emxpath types

PngImagePlugin codecs ossaudiodev unicodedata

PpmImagePlugin codeop parser unittest

PsdImagePlugin collections pdb urllib

Queue colorsys pickle urllib2

ScrolledText command pickletools urlparse

SgiImagePlugin commands pip user

SimpleDialog compileall pipes util

SimpleHTTPServer compiler pkg_resources uu

SimpleXMLRPCServer connectors pkgutil uuid

SocketServer constants platform virtualenv

SpiderImagePlugin contextlib plistlib virtualenv_support

StringIO cookielib popen2 w3lib

SunImagePlugin copy poplib warnings

TYPES copy_reg posix wave

TarIO crypt posixfile weakref

TgaImagePlugin csv posixpath web

TiffImagePlugin ctypes pprint webbrowser

TiffTags curses profile whichdb

Tix databases protocol wsgiref

Tkconstants datetime pstats xdrlib

Tkdnd dateutil pty xml

Tkinter dbhash pwd xmllib

UserDict decimal py_compile xmlrpclib

UserList dialects pyclbr xxsubtype

UserString difflib pydoc yaml

WalImageFile dircache pydoc_data yappi

WmfImagePlugin dis pyexpat zipfile

XVThumbImagePlugin distutils quopri zipimport

XbmImagePlugin django random zlib

XpmImagePlugin doctest re zope

Enter any module name to get more help. Or, type "modules spam" to search

for modules whose descriptions contain the word "spam".

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