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Variable in Python

A variable is a name used to store data in a Python program.

In Python, you don’t need to declare the data type of a variable separately. Python automatically determines the type based on the value assigned to it.

Creating a Variable

A variable is created when you assign a value to it using the = operator.

name = "Krishna"
age = 25
salary = 25000

Here:

• name stores a string.
• age stores an integer.
• salary stores an integer.

Example

name = "Krishna"
age = 25

print(name)
print(age)

Output:

Krishna
25

Different Types of Variables

Python variables can store different types of data.

name = "Krishna"       # String
age = 25               # Integer
height = 5.8           # Float
is_student = True      # Boolean

Multiple Variables

Python allows you to assign values to multiple variables in one line.

x, y, z = 10, 20, 30

print(x)
print(y)
print(z)

Output:

10
20
30

Same Value to Multiple Variables

You can assign the same value to multiple variables.

x = y = z = 100

print(x)
print(y)
print(z)

Output:

100
100
100

Changing the Value of a Variable

A variable’s value can be changed during program execution.

age = 20

print(age)

age = 25

print(age)

Output:

20
25

Rules for Naming Variables

Python variable names follow these rules:

1. A variable name must start with a letter or underscore _.
2. It cannot start with a number.
3. It can contain letters, numbers, and underscores.
4. Variable names are case-sensitive.
5. Python keywords cannot be used as variable names.

Valid Variable Names

name = "Krishna"
age1 = 25
student_name = "Rahul"
_marks = 90

Invalid Variable Names

1name = "Krishna"      # Invalid
student-name = "Rahul" # Invalid
class = 10             # Invalid

Case-Sensitive Variables

Python is case-sensitive.

name = "Krishna"
Name = "Rahul"

print(name)
print(Name)

Here, name and Name are two different variables.

Checking Variable Type

You can use the type() function to check the data type of a variable.

age = 25
name = "Krishna"

print(type(age))
print(type(name))

Output:

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

Conclusion

Variables are one of the fundamental concepts in Python. They are used to store and manipulate data throughout a program.

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