目录
- python help使用
- modules
- keywords
- symbols
python help使用
| C:\Users\wusong>python | |
| Python.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.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/.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:: UserWarning: The numpy.array_api submodule is still experimental. See NEP 47. | |
| __import__(info.name) | |
| PIL asyncpg idna selenium | |
| PyInstaller atexit imaplib serial | |
| PyQt atlastk imghdr setuptools | |
| __future__ attr imp shelve | |
| _abc attrs importlib shlex | |
| _ast audioop inspect shutil | |
| _asyncio backports io signal | |
| _bisect base ipaddress simplejson | |
| _blake bcrypt itertools site | |
| _bootlocale bdb jinja six | |
| _bz billiard json smtpd | |
| _cffi_backend binascii keyword smtplib | |
| _codecs binhex kiwisolver sndhdr | |
| _codecs_cn bisect kombu sniffio | |
| _codecs_hk broadcaster libto3 socket | |
| _codecs_iso builtins libfuturize socketserver | |
| _codecs_jp bz libpasteurize socks | |
| _codecs_kr cProfile linecache sockshandler | |
| _codecs_tw calendar locale sortedcontainers | |
| _collections celery logging sqlalchemy | |
| _collections_abc certifi loguru sqlite | |
| _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 nturlpath tarfile | |
| _markupbase configparser numbers telnetlib | |
| _md 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 cv 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 | |
| _sha dbm pickle trio_websocket | |
| _sha decimal pickletools tty | |
| _sha deepdiff pip turtle | |
| _sha difflib pipes turtledemo | |
| _signal dis pkg_resources types | |
| _sitebuiltins distlib pkgutil typing | |
| _socket distutils platform typing_extensions | |
| _sqlite django platformdirs tzdata | |
| _sre doctest plistlib unicodedata | |
| _ssl dotenv poplib unittest | |
| _stat dummy_threading posixpath urllib | |
| _statistics easy_install pprint urllib | |
| _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 win_setctime | |
| _weakref ftplib pylab winctypes | |
| _weakrefset functools pyparsing winreg | |
| _winapi future pyqt_plugins winsound | |
| _xxsubinterpreters gc pyqt_tools wsgiref | |
| _yaml genericpath pytz wsproto | |
| abc getopt qt_applications xdrlib | |
| aifc getpass qt_tools xlrd | |
| altgraph gettext queue xlwt | |
| amqp glob quopri xml | |
| antigravity greenlet random xmlrpc | |
| anyio gzip re xxsubtype | |
| argparse h 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)-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.ansitowin.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~~~