Build python environment and Python file types

• Linux Environment

  -The Python environment is installed by default for most Linux distributions.

  -Enter Python to launch Python interactive mode

  -Recommended use of VIM for program editors

• Windows environment

  -Download the MSI package to install Python directly

  -A GUI development environment that comes with Python

  -Many development tools

# Linux Interactive interface [[email protected] ~]# Pythonpython 2.6.6 (r266:84292, Jan, 09:37:14) [GCC 4.4.7 20120313 (Red Hat 4.4.7 -4)] on Linux2type ' help ', ' copyright ', ' credits ' or ' license ' for more information.# exit instruction >>>exit () [[Email Protec Ted] ~]## text mode [[email protected] ~]# vim 1.pyprint ' Hello world ' [[email protected] ~]# python 1.pyhello world>>> print ' Hello world ' Hello world>>> exit () [[email protected] ~]#

Python file types

• Source
  

-Python source code file with "py" as extension, interpreted by Python program, do not need to compile

[[email protected] ~]# vim 1.py# python standard format #!/usr/bin/pythonprint ' Hello World ' [[email protected] ~]# chmod +x 1.py[[email Protected] ~]# ls-l 1.py-rwxr-xr-x 1 root root 39 June 08:59 1.py[[email protected] ~]#./1.pyhello World

• BYTE code

  -Python source files are compiled and produced with the extension "PYc" files

# Introducing modules, compiling for 1.py [[email protected] shell]# vim 2.pyimport py_compilepy_compile.compile ("1.py") # Compiling with Python [[email Protected] shell]# python 2.py[[email protected] shell]## This generates a file that ends in PYC [[email protected] shell]# ls-l Total usage 12-rwxr-xr- X 1 root root 39 June 08:59 1.py-rw-r--r--1 root root 112 June 10:37 1.pyc-rwxr-xr-x 1 root root 46 June 21 10:37 2. py# This file can also be executed [[email protected] shell]# python 1.pychello World

• Optimized code

  -Optimized source file with "pyo" extension

[[email protected] shell]# Python-o-M py_compile 1.py[[email protected] shell]# ls-l Total usage 16-rwxr-xr-x 1 root root 39 June  08:59 1.py-rwxr-xr-x 1 root root 112 June 10:37 1.pyc-rwxr-xr-x 1 root root 112 June 10:44 1.pyo-rwxr-xr-x 1 root Root 46 June 10:37 2.py

Three kinds of code execution effects

[[email protected] shell]# python 1.pyhello world[[email protected] shell]# python 1.pychello world[[email protected] Shel l]# python 1.pyohello World

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Build python environment and Python file types