Python Past and Present

Python founder of Guido van Rossum (Guido van Rossum). During Christmas 1989, Guido van Rossum in Amsterdam in order to pass the time, determined to develop a new script interpreter, ABC language as an inheritance.

Why is Python rather than other languages?

　　C and Python, Java, C #, etc.

　　　　C language: code is compiled machine code to obtain, directly in the machine code executed on the processor, each instruction control CPU work

　　　　Other Languages: obtained code is compiled byte code, virtual machine executing byte code and then converted into machine code executed on a processor after

　　Python Python and C is the language developed from C

　　　　For use: Python library complete and simple to use, if you want to achieve the same function, Python 10 lines of code can solve, C may need 100 lines or more.
　　　　For speed: Python running speed compared with C, absolute force It is slow

　　Python and Java, C #, etc.

　　　　For: Linux original Python, no other language; the language has more than a few very rich class library support
　　　　for speed: Python in speed may slightly less

　　　　So, Python and other languages no essential difference, other differences: a good field, rich talent, preconceptions.

Python species

Cpython
official version of Python, using the C language, the most widely used, CPython will realize the source file (py file) into byte code file (pyc files), then run on Python virtual machine.
Jyhton
Python Java implementation, Jython Python code will be dynamically compiled into Java byte code, and then runs on the JVM.
IronPython
Python C # implementation, the IronPython C # Python code into byte code, and then run on the CLR. (Jython and similar)
PyPy (special)
Python implemented Python, Python bytecode will compile the bytecode into machine code.
RubyPython, Briton ...

python environment

　　Installing Python

　　　　Windows：

Download Python Package
1. 　　https://www.python.org/downloads/
Installing Python
1. 　　默认安装路径：C:\python27
Configuration python environment

　　The configuration of the Python environment variable can be

　　　　linux:

　　　　　　Linux comes with the yum-dependent Python, in order to prevent errors, here is the update actually install a Python

 
        查看默认Python版本 
       
        python  
        - 
        V 
       
        1 
        、安装gcc，用于编译Python源码 
       
        yum install gcc 
       
        2 
        、下载源码包，https: 
        / 
        / 
        www.python.org 
        / 
        ftp 
        / 
        python 
        / 
       
        3 
        、解压并进入源码文件 
       
        4 
        、编译安装 
       
        . 
        / 
        configure 
       
        make  
        all 
       
        make install 
       
        5 
        、查看版本 
       
        / 
        usr 
        / 
        local 
        / 
        bin 
        / 
        python2. 
        7 
         -V 
       
        6 
        、修改默认Python版本 
       
        mv  
        / 
        usr 
        / 
        bin 
        / 
        python  
        / 
        usr 
        / 
        bin 
        / 
        python2. 
        6 
       
        ln  
        - 
        s  
        / 
        usr 
        / 
        local 
        / 
        bin 
        / 
        python2. 
        7 
         /usr/bin/python 
       
        7 
        、防止yum执行异常，修改yum使用的Python版本 
       
        vi  
        / 
        usr 
        / 
        bin 
        / 
        yum 
       
        将头部  
        #!/usr/bin/python 修改为 #!/usr/bin/python2.6

Patricia school Python- Lesson 1: the basics