How to define a variable in python

Variables in Python do not need to be declared. Each variable must be assigned a value before use. The variable will not be created until the variable is assigned a value.

In Python, a variable is a variable, it has no type. What we call "type" is the type of the object in memory pointed by the variable.

The equal sign (=) is used to assign values ​​to variables.

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:

counter = 100          # 整型变量
miles   = 1000.0       # 浮点型变量
name    = "runoob"     # 字符串
 
print (counter)
print (miles)
print (name)

Executing the above program will result in output

100
1000.0
runoob

Assigning multiple variables

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

a = b = c = 1

The above example creates an integer object with a value of 1, assigns values ​​from back to front, and the three variables are assigned the same value.

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

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

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