In Python (programming language), a variable is used to store data or values that can be used later in a program. Variables act as containers that hold information such as numbers, text, or lists.

Python makes working with variables easy because you do not need to declare the data type explicitly.

📌 Creating Variables

In Python, a variable is created when you assign a value to it using the assignment operator (=).

Example:

name = "John"
age = 25
price = 19.99

Here:

  • name stores a string
  • age stores an integer
  • price stores a floating-point number

🖨 Example Program Using Variables

name = "Alice"
age = 22
print(name)
print(age)

Output:

Alice
22

🔄 Changing Variable Values

The value of a variable can be changed during program execution.

Example:

x = 10
x = 20
print(x)

Output:

20

📦 Multiple Variables

You can assign values to multiple variables in one line.

x, y, z = 5, 10, 15
print(x, y, z)

🔁 Assigning One Value to Multiple Variables

x = y = z = 100
print(x, y, z)

📏 Rules for Naming Variables

When creating variables in Python, follow these rules:

✅ Variable names:

  • Must start with a letter or underscore
  • Can contain letters, numbers, and underscores
  • Are case-sensitive

Examples:

name
age
_total
student_marks

❌ Invalid variable names:

2name
my-name
class

⭐ Good Naming Practices

Use meaningful variable names to make code easier to understand.

Example:

student_name = "Rahul"
total_marks = 85

Instead of:

a = "Rahul"
b = 85

🚀 Key Points

  • Variables store data in a program.
  • Python automatically determines the data type.
  • Variables are created when a value is assigned.
  • Variable names should be meaningful and follow naming rules.