Python Learning-baseno.1

First, Introduction:

Python: scripting language, interpreted language

Operation and maintenance of the necessary language, the application of the field is very broad, the future is broad.

Indentation is a very important point in Python syntax.

Python3 is the future development trend

Second, Python installation:

Windows:

1. Download the installation package:

https://www.python.org/downloads/

    默认安装路径：C:\python2.7


    3、配置环境变量


    【右键计算机】--》【属性】--》【高级系统设置】--》【高级】--》【环境变量】--》【在第二个内容框中找到 变量名为Path 的一行，双击】 --> 【Python安装目录追加到变值值中，用 ； 分割】

    如：原来的值;C:\python27，切记前面有分号

  linux & mac


    自带安装


三、第一个python程序

     print ("Hello World")

      Specify interpreter: If you want to execute a python script like executing a shell script, for example:   ./HELLO.PY 

    #!/usr/bin/env python


    1、Variable names can only be any combination of letters, numbers, or underscores

2. The first character of a variable name cannot be a number

3. Variable name cannot be a keyword

4, the variable name can not contain spaces and special characters (_ except)

Code:-*-coding:utf-8-*-

Five, module

Python has a rich and powerful library of standards and third-party libraries, which can be implemented in a non-language comparable capacity.

Import Sys

Print (Sys.path)

Import OS

Os.system ("df-th") #调用系统命令

Customizing the TAB Completion module

Import Sys

Import ReadLine

Import Rlcompleter

if sys.platform = = ' Darwin ' and sys.version_info[0] = = 2:

Readline.parse_and_bind ("Bind ^i Rl_complete")

Else

Readline.parse_and_bind ("Tab:complete") # Linux and Python3 on Mac

For Mac

This article is from the "LE" blog, please be sure to keep this source http://lz001.blog.51cto.com/8294567/1792820

Python Learning-baseno.1