python下help()使用方法
查看python所有的modules：help("modules")单看python所有的modules中包含指定字符串的modules： help("modules yourstr")查看python中常见的topics： help("topics")查看python标准库中的module：import os.path + help("os.path")查看python内置的类型：help("list")查看python类型的成员方法：help("str.find") 查看python内置函数：help("open")举例：>>> help("modules")
Please wait a moment while I gather a list of all available modules...
1 abc html setuptools__future__ aifc http shelve_ast antigravity idlelib shlex_bisect argparse imaplib shutil_bootlocale array imghdr signal_bz2 ast imp site_codecs asynchat importlib smtpd_codecs_cn asyncio inspect smtplib_codecs_hk asyncore io sndhdr_codecs_iso2022 atexit ipaddress socket_codecs_jp audioop itertools socketserver_codecs_kr base64 json sqlite3_codecs_tw bdb keyword sre_compile_collections binascii lib2to3 sre_constants_collections_abc binhex linecache sre_parse_compat_pickle bisect locale ssl_compression builtins logging stat_csv bz2 lzma statistics_ctypes cProfile macpath string_ctypes_test calendar macurl2path stringprep_datetime cgi mailbox struct_decimal cgitb mailcap subprocess_dummy_thread chunk marshal sunau_elementtree cmath math symbol_functools cmd mimetypes symtable_hashlib code mmap sys_heapq codecs modulefinder sysconfig_imp codeop msilib tabnanny_io collections msvcrt tarfile_json colorsys multiprocessing telnetlib_locale compileall netrc tempfile_lsprof concurrent nntplib test_lzma configparser nt textwrap_markupbase contextlib ntpath this_md5 copy nturl2path threading_msi copyreg numbers time_multibytecodec crypt opcode timeit_multiprocessing csv operator tkinter_opcode ctypes optparse token_operator curses os tokenize_osx_support datetime parser trace_overlapped dbm pathlib traceback_pickle decimal pdb tracemalloc_pydecimal difflib pickle tty_pyio dis pickletools turtle_random distutils pip turtledemo_sha1 doctest pipes types_sha256 dummy_threading pkg_resources typing_sha512 easy_install pkgutil unicodedata_signal email platform unittest_sitebuiltins encodings plistlib urllib_socket ensurepip poplib uu_sqlite3 enum posixpath uuid_sre errno pprint venv_ssl faulthandler profile warnings_stat filecmp pstats wave_string fileinput pty weakref_strptime fnmatch py_compile webbrowser_struct formatter pyclbr winreg_symtable fractions pydoc winsound_testbuffer ftplib pydoc_data wsgiref_testcapi functools pyexpat xdrlib_testimportmultiple gc queue xml_testmultiphase genericpath quopri xmlrpc_thread getopt random xxsubtype_threading_local getpass re zipapp_tkinter gettext reprlib zipfile_tracemalloc glob rlcompleter zipimport_warnings gzip runpy zlib_weakref hashlib sched_weakrefset heapq select_winapi hmac selectors
Enter any module name to get more help.Or, type "modules spam" to searchfor modules whose name or summary contain the string "spam".
举例：查看某个模块的具体使用帮助：>>> help("linecache")Help on module linecache:
NAME linecache - Cache lines from Python source files.
DESCRIPTION This is intended to read lines from modules imported -- hence if a filename is not found, it will look down the module search path for a file by that name.
FUNCTIONS checkcache(filename=None) Discard cache entries that are out of date. (This is not checked upon each call!)
clearcache() Clear the cache entirely.
getline(filename, lineno, module_globals=None)
DATA __all__ = ['getline', 'clearcache', 'checkcache']
FILE c:\python3.5\lib\linecache.py
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