01. Basic python knowledge,

01. Basic python knowledge,
I. What are the differences between compiled and interpreted languages?

1. Compile the source program into machine code and save the result as a binary file. You can directly use the compiled file at runtime.

2. Only when executing a program is interpreted as a machine language for execution by a computer. Therefore, the running speed is not as fast as that of the compiled program. Python is an interpreted language.

Ii. Install python3.x

1. Download the installation package https://www.python.org/downloads/

2. default installation path: C: \ python35

3. Configure the environment variable [Right-click the computer] --> [properties] --> [advanced system settings] --> [advanced] --> [environment variable] --> 【 in the second content box, find a line with the variable name Path, double-click to add the python installation path to a new line (win10 )]

 

Iii. Example of variable assignment

Name = "Oldboylinux"

Name2 = name

Print ("My name is", name, name2)

 

Name = "FeiYangYang"

Print ("My name is", name, name2)

===== Output result ====

My name is Oldboylinux

My name is FeiYangYang Oldboylinux

Drawing description

 

4. How to annotate content and coding definitions in python

1. Single line comment (one well number) # comment content

2. Multi-line comments (a group of three single quotes) ''' comment '''

3. Define the encoding (python uses ASCII code by default)

#! /Usr/bin/env python

#-*-Coding: UTF-8 -*-

======= LHS at least /08/20 ======