Python內建help函數的詳細介紹

英文文件：

help([object##])

Invoke the built-in help system. (This function is intended for interactive use.) If no argument is given, the interactive help system starts on the interpreter console. If the argument is a string, then the string is looked up as the name of a module, function, class, method, keyword, or documentation topic, and a help page is printed on the console. If the gument is printed on the console. If the gument is object, a help page on the object is generated.

This function is added to the built-in namespace by the

site module.

 

##說明：

　　1. 在解釋器互動介面，不傳參數呼叫函數時，將啟動內建的幫助系統，並進入幫助系統。在幫助系統內部輸入模組、類別、函數等名稱時，將顯示其使用說明，輸入quit退出內建幫助系統，並返回互動介面。

>>> help() #不带参数

Welcome to Python 3.5's 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/3.5/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".

#进入内置帮助系统  >>> 变成了 help>
help> str #str的帮助信息
Help on class str in module builtins:

class str(object)
 |  str(object='') -> str
 |  str(bytes_or_buffer[, encoding[, errors]]) -> str
 |  
 |  Create a new string object from the given object. If encoding or
 |  errors is specified, then the object must expose a data buffer
 |  that will be decoded using the given encoding and error handler.
 |  Otherwise, returns the result of object.__str__() (if defined)
 |  or repr(object).
 |  encoding defaults to sys.getdefaultencoding().
 |  errors defaults to 'strict'.
 |  
 |  Methods defined here:
 |  
 |  __add__(self, value, /)
 |      Return self+value.
 ................................


help> 1 #不存在的模块名、类名、函数名
No Python documentation found for '1'.
Use help() to get the interactive help utility.
Use help(str) for help on the str class.

help> quit #退出内置帮助系统

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.

# 已退出内置帮助系统，返回交互界面 help> 变成 >>>
>>>

2. 在解釋器互動介面，傳入參數呼叫函數時，將尋找參數是否為模組名稱、類別名稱、函數名，如果將顯示其使用說明。

>>> help(str) 
Help on class str in module builtins:

class str(object)
 |  str(object='') -> str
 |  str(bytes_or_buffer[, encoding[, errors]]) -> str
 |  
 |  Create a new string object from the given object. If encoding or
 |  errors is specified, then the object must expose a data buffer
 |  that will be decoded using the given encoding and error handler.
 |  Otherwise, returns the result of object.__str__() (if defined)
 |  or repr(object).
 |  encoding defaults to sys.getdefaultencoding().
 |  errors defaults to 'strict'.
 |  
 |  Methods defined here:
 |  
 |  __add__(self, value, /)
 |      Return self+value.
 |  
  ***************************

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