Python variables

In this article, you will learn about Python variables. A Python variable is a container to store a value of any type. Where Container refers to a single memory location on the system.  An assignment operator is used to assign a value to the variable.

Variables in Python are created directly when they are needed in the program. Below is the syntax to create a variable in python.

A=5
Name= "john"
Length =4.6

Python variables are not declared by specifying any data type. Their data type is automatically assigned on the bases of the value that is going to store in a variable.

Example 1: How to check the data type of python variables

In python, we can check the data type of any variable by using the type () function.

Code

A = 5
Name = "john"
Length = 4.6
print(type(A))
print(type(Name))
print(type(Length))

Output

<class 'int'>
<class 'str'>
<class 'float'>

Example 2: How to specify the Data type of the python variable

We can check it by using python casting. To do this we can use inbuilt functions int(), float() and str().

Syntax

A= int(5)
Name = str("john")
Length  = float(4.6)

Rules to writing a variable name in python

• Python variable must start with a letter or underscore
• A variable name cannot start with numbers.
• Variable name only contains alpha-numeric (Aa-Zz, 0-9) and underscore “–”
• They are case sensitive, which means that A and a are two different variable names.

Example 3: Some legal variable names in python

Students
Subject2
User_Name
logic
_age

Example4: Some Illegal variable names in Python

Student Marks
2num
Your-name
!number

Example 5: Assign a single value to multiple variables in Python

Python gives the permission to assign a single value to multiple variables. Below is the example

a = b = c = 1
print(a)
print(b)
print(c)

Output

1
1
1

Example 6: Assign multiple values to multiple variables in python

Code

a,b,c = "red", "blue", "green"
print(a)
print(b)
print(c)

Output

red
blue
green