python的help用法

一、进入交互模式

打开cmd命令行窗口，输入python效果如下：

D:\Company\Code\python>python
Python 2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:19:30) [MSC v.1500 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> 

二、使用help()查看帮助

1、输入help(raw_input)查看，效果如下:

>>> help(raw_input)
Help on built-in function raw_input in module __builtin__:


raw_input(...)
    raw_input([prompt]) -> string


    Read a string from standard input.  The trailing newline is stripped.
    If the user hits EOF (Unix: Ctl-D, Windows: Ctl-Z+Return), raise EOFError.
    On Unix, GNU readline is used if enabled.  The prompt string, if given,
    is printed without a trailing newline before reading.

2、输入help(input)查看，效果如下:

>>> help(input)
Help on built-in function input in module __builtin__:


input(...)
    input([prompt]) -> value


    Equivalent to eval(raw_input(prompt)).