1. Python Variable settings

1. What is a variable

Variable as the name implies the amount of change, the amount is a way of representing a state, and can be changed

2, why to use the variable

The execution of a program is always in a state of flux, and we can use a variable to represent the state of the program in progress and record it.

3. How to use variables

Key=value

Example

A=123

Three elements of a variable:

Key ———— "a"

= ————— "Assigned value

123 ———— "Specific status (content)

A variable is defined in a way that has its fixed name:

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

The first character of a variable name cannot be a number

Cannot conflict with Python keyword (avoid invoking problems in use)

[' and ', ' as ', ' assert ', ' Break ', ' class ', ' Continue ', ' Def ', ' del ', ' elif ', ' Else ', ' except ', ' exec ', ' finally ', ' for ', ' F ' Rom ', ' Global ', ' if ', ' import ',

' In ', ' was ', ' lambda ', ' not ', ' or ', ' pass ', ' print ', ' raise ', ' return ', ' Try ', ' when ', ' with ', ' yield ']

The significance of defining variables is that we call this variable later, so it is best to set the variable name with its special meaning, example:

Name= ' Wyf '

Age=26

salary=1000000 # #意淫的

Underline is also good, can be relatively clear expression of a relatively long variable:

student_of_middle=300 #中学生300人

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　

1. Python Variable settings