python命令行进入帮助模式_python的help()用法

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)).