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’: , ‘sre_compile’: , ‘_sre’: , ‘encodings’: , ‘site’: , ‘__builtin__’: , ‘sysconfig’: , ‘__main__’: , ‘encodings.encodings’: none, ‘abc’: , ‘posixpath’: , ‘_weakrefset’: , ‘errno’: , ‘encodings.codecs’: none, ‘sre_constants’: , ‘re’: , ‘_abcoll’: , ‘types’: , ‘_codecs’: , ‘_warnings’: , ‘genericpath’: , ‘stat’: , ‘zipimport’: , ‘encodings.__builtin__’: none, ‘warnings’: , ‘userdict’: , ‘encodings.utf_8’: , ‘sys’: , ‘codecs’: , ‘readline’: , ‘os.path’: , ‘signal’: , ‘traceback’: , ‘linecache’: , ‘posix’: , ‘encodings.aliases’: , ‘exceptions’: , ‘sre_parse’: , ‘os’: , ‘_weakref’: }
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.”)
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enter any module name to get more help. or, type “modules spam” to search
for modules whose descriptions contain the word “spam”.