Python comments, script parameters, bytecode

python comments, script parameters, bytecode

--Tao Xin

python installation

1. Download the installation package

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

2. Installation

Default installation path: C:\python27

3. Configure Environment variables

"Right-click Computer"-"Properties"-"Advanced system Settings"-"Advanced"-"Environment variable"-"in the second content box to find the variable named path of a row, double-click"-"Python installation directory appended to the variable value, with;

such as: the original value; C:\python27, remember that there's a semicolon in front

NotesSingle-line Comment #

eg

#   print "123"

Multiline comment "" "" ""

(three quotes start, end)

eg

“””

Import Sys

Print SYS.ARGV

print ' Hello, world '

“””

Style= "Background-color: #ff0000;" > Script Parameters

Python has a large number of modules, which makes developing Python programs very concise. The class library includes three:

• Python-supplied modules
• Industry-Open Source modules
• Modules developed by programmers themselves

eg

New hello.py

#!/usr/bin/env python

#-*-Coding:utf-8-*-

Import Sys

Print SYS.ARGV

print ' Hello, world '

#捕获参数

Input: Python hello.py localhost:8001

Output: [' hello.py ', ' localhost:8001 ']

Hello, world

byte code

eg

New hello.py File

#!/usr/bin/env python

#-*-Coding:utf-8-*-

print ' Hello, world '

#字节码

Import m

print "Hello"

New m.py File

#!/usr/bin/env python

#-*-Coding:utf-8-*-

print "Hello Daoxin"

Input: Python hello.py localhost:8001

Output: Hello, world

Hello Daoxin

Hello

Execution process: hello.py will import the module in m.py

Note: If M.PYC performs the same function as m.py, execute the M.PYC directly; If the function is not the same, the execution m.py after the formation of M.PYC re-execution

Python comments, script parameters, bytecode