What are Python variables? A brief discussion on variable assignment in Python variables-Python Tutorial-php.cn

What are Python variables? A brief discussion on variable assignment in Python variables

Tomorin

Release： 2018-08-13 17:12:07

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Python variables is a knowledge point that cannot be avoided in programming. Only with Pythonvariables can the code operate normally, and the value is particularly important. VariableThe value stored in memory, which means that when a variable is created, a space will be opened in memory, based on variable The interpreter will allocate the specified memory and decide what data can be stored in the memory. Therefore, variables can specify different data types, and these variables can Stores integers , decimals or characters .

Variable assignment

Variable assignment in Python does not require a type declaration. Each variable is created in memory and includes information such as the variable's identity, name and data. Each variable must be assigned a value before use. The variable will not be created until the variable is assigned a value. The equal sign (=) is used to assign a value to a variable.

The

on the left side of the equal sign (=) operator

is a

variable name , and the right side of the equal sign (=) operator is the value # stored in the variable #. For example:

#!/usr/bin/python
# -*- coding: UTF-8 -*-
counter = 100         # 赋值整型变量
miles = 1000.0        # 浮点型
name = "John"                # 字符串

 print counter
 print miles
 print name

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In the above example, 100, 1000.0 and "John" are assigned to the counter, miles and name variables respectively. Executing the above program will output the following results:

100

1000.0

John

Multiple variable assignment

Python allows you to assign values to multiple variables at the same time. For example:

a = b = c = 1

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In the above example, an integer object is created with a value of 1, and three variables are allocated to the same memory space.

You can also specify multiple variables for multiple objects. For example:

a, b, c = 1, 2, "john"

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In the above example, two integer objects 1 and 2 are assigned to variables a and b respectively, and the string object "john" is assigned to variable c. Identification method: Treat the left and right sides of the equal sign as characters, corresponding one to one.

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