jython查看帮助help和模块modules
jython运行环境是需要JAVA支持的，JAVA安装百度很多。
查看JAVA是否安装成功：
[root@node ～]# java -version java version "1.8.0_261" Java(TM) SE Runtime Environment (build 1.8.0_261-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.261-b12, mixed mode)
下载好jython包，进入到jython的jar包目录里：
[root@node2 win-share]# cd ～/jython/ [root@node2 win-share]# ls -l -rwxrwxrwx. 1 root root 43056592 10月 31 20:51 jython-standalone-2.7.2.jar
jython有两种一种是包名上带“installer”字样的，代表是安装版；另一种是包名带“standalone”字样的，就可以直接用JAVA启动
这里以第二种standalone”字样举例
[root@node2 win-share]# cd ~/jython/ [root@node2 win-share]# java -jar jython-standalone-2.7.2.jar
输入等待启动，启动后就和Python一样会出现“>>>”
进入帮助函数:
>>> 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/2.7/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".
help>
看到help> ，已经就是进入帮助了。
查看jar包里有多少个模块：
help> modules Please wait a moment while I gather a list of all available modules... BaseHTTPServer cmath javapath runpy CGIHTTPServer cmd javashell sax ConfigParser code jffi sched Cookie codecs json select DocXMLRPCServer codeop jythonlib sets HTMLParser collections keyword sgmllib MimeWriter colorsys lib2to3 sha Queue command linecache shelve SimpleHTTPServer commands locale shlex SimpleXMLRPCServer compileall logging shutil SocketServer compiler macpath signal StringIO contextlib macurl2path site UserDict cookielib mailbox smtpd UserList copy mailcap smtplib UserString copy_reg markupbase sndhdr _LWPCookieJar crypt marshal socket _MozillaCookieJar csv math sre __builtin__ ctypes md5 sre_compile __future__ datetime mhlib sre_constants _abcoll dbexts mime sre_parse _ast decimal mimetools ssl _bytecodetools difflib mimetypes stat _codecs dircache mimify string _collections dis modjy struct _csv distutils multifile subprocess _fix_jython_setuptools_osx doctest mutex symbol _fsum dom netrc synchronize _functools dumbdbm new sys _google_ipaddr_r234 dummy_thread nntplib sysconfig _hashlib dummy_threading ntpath tabnanny _imp email nturl2path tarfile _io encodings numbers telnetlib _json ensurepip opcode tempfile _jyio errno operator test _jythonlib etree optparse tests _locale exceptions os textwrap _marshal filecmp parsers this _py_compile fileinput pawt thread _pyio fixes pdb threading _random fnmatch pgen2 time _rawffi formatter pickle timeit _socket fpformat pickletools token _sre fractions pipes tokenize _sslcerts ftplib pkgutil trace _strptime functools platform traceback _threading future_builtins plistlib tty _threading_local gc popen2 types _weakref genericpath poplib ucnhash _weakrefset getopt posix unicodedata abc getpass posixfile unittest aifc gettext posixpath urllib anydbm glob pprint urllib2 argparse grp profile urlparse array gzip pstats user ast hashlib pty uu asynchat heapq pwd uuid asyncore hmac py_compile warnings atexit htmlentitydefs pycimport weakref base64 htmllib pyclbr webbrowser bdb httplib pydoc whichdb binascii ihooks pydoc_data wsgiref binhex imaplib pyexpat xdrlib bisect imghdr quopri xml bz2 imp random xmllib cPickle importlib re xmlrpclib cStringIO inspect readline zipfile calendar io repr zipimport cgi isql rfc822 zlib cgitb itertools rlcompleter chunk jarray robotparser **** 以下内容略过 ****
查看模块具体使用方法：
help> encodings Help on package encodings: NAME encodings - Standard "encodings" Package FILE /media/win-share-c/jython-standalone-2.7.2.jar/Lib/encodings/__init__.py DESCRIPTION Standard Python encoding modules are stored in this package directory. Codec modules must have names corresponding to normalized encoding names as defined in the normalize_encoding() function below, e.g. 'utf-8' must be implemented by the module 'utf_8.py'. Each codec module must export the following interface: * getregentry() -> codecs.CodecInfo object The getregentry() API must a CodecInfo object with encoder, decoder, incrementalencoder, incrementaldecoder, streamwriter and streamreader atttributes which adhere to the Python Codec Interface Standard. In addition, a module may optionally also define the following APIs which are then used by the package's codec search function: * getaliases() -> sequence of encoding name strings to use as aliases Alias names returned by getaliases() must be normalized encoding names as defined by normalize_encoding(). Written by Marc-Andre Lemburg (mal@lemburg.com). (c) Copyright CNRI, All Rights Reserved. NO WARRANTY. **** 略过部分内容 ****
导入模块使用，输入部分后用Tab键显示全部函数（方法）：
>>> import encodings >>> encodings. encodings.CodecRegistryError( encodings.__builtin__ encodings.__doc__ encodings.__file__ encodings.__loader__ encodings.__name__ encodings.__package__ encodings.__path__ encodings._aliases encodings._cache encodings._import_tail encodings._java encodings._norm_encoding_map encodings._unknown encodings.aliases encodings.codecs encodings.hex_codec encodings.idna encodings.normalize_encoding( encodings.search_function( encodings.utf_8 encodings.__class__( encodings.__delattr__( encodings.__dict__ encodings.__ensure_finalizer__( encodings.__format__( encodings.__getattribute__( encodings.__hash__( encodings.__init__( encodings.__new__( encodings.__reduce__( encodings.__reduce_ex__( encodings.__repr__( encodings.__setattr__( encodings.__str__( encodings.__subclasshook__(
standalone
