python入门学习之自带help功能初步使用示例
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python help使用
C:\Users\wusong>python
Python 3.8.2rc1 (tags/v3.8.2rc1:8623e68, Feb 11 2020, 10:46:21) [MSC v.1916 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
输入help()
>>> help
Type help() for interactive help, or help(object) for help about object.
>>> help()
Welcome to Python 3.8's help utility!
If this is your first time using Python, you should definitely check out
the tutorial on the Internet at https://docs.python.org/3.8/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, symbols, or topics, type
"modules", "keywords", "symbols", or "topics". Each module also comes
with a one-line summary of what it does; to list the modules whose name
or summary contain a given string such as "spam", type "modules spam".
help>
这句话：To get a list of available modules, keywords, symbols, or topics, type "modules", "keywords", "symbols", or "topics".
意思就是：
要获取可用模块、关键字、符号或主题的列表，请键入 “模块”、“关键字”、“符号”或“主题”。
modules
我们先看下modules
在help模式下输入：modules
help> modules
Please wait a moment while I gather a list of all available modules...
D:\software_install\python\lib\pkgutil.py:92: UserWarning: The numpy.array_api submodule is still experimental. See NEP 47.
__import__(info.name)
PIL asyncpg idna selenium
PyInstaller atexit imaplib serial
PyQt5 atlastk imghdr setuptools
__future__ attr imp shelve
_abc attrs importlib shlex
_ast audioop inspect shutil
_asyncio backports io signal
_bisect base64 ipaddress simplejson
_blake2 bcrypt itertools site
_bootlocale bdb jinja2 six
_bz2 billiard json smtpd
_cffi_backend binascii keyword smtplib
_codecs binhex kiwisolver sndhdr
_codecs_cn bisect kombu sniffio
_codecs_hk broadcaster lib2to3 socket
_codecs_iso2022 builtins libfuturize socketserver
_codecs_jp bz2 libpasteurize socks
_codecs_kr cProfile linecache sockshandler
_codecs_tw calendar locale sortedcontainers
_collections celery logging sqlalchemy
_collections_abc certifi loguru sqlite3
_compat_pickle cffi lzma sqlparse
_compression cgi mailbox sre_compile
_contextvars cgitb mailcap sre_constants
_csv charset_normalizer markupsafe sre_parse
_ctypes chunk marshal ssl
_ctypes_test click math starlette
_datetime click_didyoumean matplotlib stat
_decimal click_plugins mimetypes statistics
_dummy_thread click_repl mmap string
_elementtree cmath modulefinder stringprep
_functools cmd msilib struct
_hashlib code msvcrt subprocess
_heapq codecs multiprocessing sunau
_imp codeop nacl symbol
_io collections netrc symtable
_json colorama nntplib sys
_locale colorsys nt sysconfig
_lsprof compileall ntpath tabnanny
_lzma concurrent nturl2path tarfile
_markupbase configparser numbers telnetlib
_md5 contextlib numpy tempfile
_msi contextvars opcode test
_multibytecodec contourpy operator textwrap
_multiprocessing copy optparse tftpy
_opcode copyreg ordered_set this
_operator crypt ordlookup threading
_osx_support cryptography os time
_overlapped csv outcome timeit
_pickle ctypes packaging tkinter
_py_abc curses paramiko token
_pydecimal cv2 parser tokenize
_pyinstaller_hooks_contrib cycler past tortoise
_pyio databases pathlib trace
_queue dataclasses pdb traceback
_random datetime pefile tracemalloc
_ruamel_yaml dateutil peutils trio
_sha1 dbm pickle trio_websocket
_sha256 decimal pickletools tty
_sha3 deepdiff pip turtle
_sha512 difflib pipes turtledemo
_signal dis pkg_resources types
_sitebuiltins distlib pkgutil typing
_socket distutils platform typing_extensions
_sqlite3 django platformdirs tzdata
_sre doctest plistlib unicodedata
_ssl dotenv poplib unittest
_stat dummy_threading posixpath urllib
_statistics easy_install pprint urllib3
_string email prettytable uu
_strptime encodings profile uuid
_struct ensurepip prompt_toolkit uvicorn
_symtable enum pstats venv
_testbuffer errno psutil vine
_testcapi fastapi pty virtualenv
_testconsole faulthandler py_compile warnings
_testimportmultiple filecmp pyclbr watchfiles
_testmultiphase fileinput pycparser wave
_thread filelock pydantic wcwidth
_threading_local fnmatch pydoc weakref
_tkinter fontTools pydoc_data webbrowser
_tracemalloc formatter pyecharts websockets
_warnings fractions pyexpat win32_setctime
_weakref ftplib pylab win32ctypes
_weakrefset functools pyparsing winreg
_winapi future pyqt5_plugins winsound
_xxsubinterpreters gc pyqt5_tools wsgiref
_yaml genericpath pytz wsproto
abc getopt qt5_applications xdrlib
aifc getpass qt5_tools xlrd
altgraph gettext queue xlwt
amqp glob quopri xml
antigravity greenlet random xmlrpc
anyio gzip re xxsubtype
argparse h11 reprlib yaml
array hashlib requests zipapp
asgiref heapq rlcompleter zipfile
ast hmac runpy zipimport
async_generator html sched zlib
asynchat http secrets
asyncio httptools select
asyncore idlelib selectors
Enter any module name to get more help. Or, type "modules spam" to search
for modules whose name or summary contain the string "spam".
help>
从这里可以看出还是有相当多的模块，比如我们常用的re,xlrd当然也有我们后期安装的；挑一个进去看看，有啥风景，就挑xlrd
help> xlrd
Help on package xlrd:
NAME
xlrd
DESCRIPTION
# Copyright (c) 2005-2012 Stephen John Machin, Lingfo Pty Ltd
# This module is part of the xlrd package, which is released under a
# BSD-style licence.
PACKAGE CONTENTS
biffh
book
compdoc
formatting
formula
info
sheet
timemachine
xldate
FUNCTIONS
count_records(filename, outfile=<colorama.ansitowin32.StreamWrapper object at 0x000001D26AC13D00>)
For debugging and analysis: summarise the file's BIFF records.
ie: produce a sorted file of ``(record_name, count)``.
:param filename: The path to the file to be summarised.
:param outfile: An open file, to which the summary is written.
-- More -- 行数:
这里面会详细介绍xlrd模块的名字，描述，模块目录、功能、版本、文件位置等信息，在最后一行看到-- More -- ，这是一个分页符，表示当前页面不能全部显示所有信息，需要部分分页操作，可以使用空格键切换下一页，也可以使用回车键看下一行，看你自己的需求进行操作，如果不想看了可输入q退出阅读模式，进入help模式，再输入q则可以继续退出help模式；
help> q
You are now leaving help and returning to the Python interpreter.
If you want to ask for help on a particular object directly from the
interpreter, you can type "help(object)". Executing "help('string')"
has the same effect as typing a particular string at the help> prompt.
>>>
keywords
再看下我们后面会常说的关键字
help> keywords
Here is a list of the Python keywords. Enter any keyword to get more help.
False class from or
None continue global pass
True def if raise
and del import return
as elif in try
assert else is while
async except lambda with
await finally nonlocal yield
break for not
symbols
这个是罗列了我们在python语言中涉及的运算符
help> symbols
Here is a list of the punctuation symbols which Python assigns special meaning
to. Enter any symbol to get more help.
!= + <= __
" += <> `
""" , == b"
% - > b'
%= -= >= f"
& . >> f'
&= ... >>= j
' / @ r"
''' // J r'
( //= [ u"
) /= \ u'
* : ] |
** < ^ |=
**= << ^= ~
*= <<= _
ok，差不多就简单的到这了，里面具体的内容还需要在后期使用过程中发现，modules里面的内容是最多的，当然即使你不看这些东西也不影响你学习python，这些都是都是辅助~~~
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