Variables

Variables are one of the most important concepts in Python programming. A variable is used to store data that can be used later in a program.

CIIT Training Institute : Understanding variables clearly will make it easier to learn data types, operators, functions, collections, and real-world Python applications.

What is a Variable?

A variable is a name that refers to a value stored in memory. In Python, you do not need to declare the variable type separately.

Python determines the type automatically based on the value assigned to the variable.

Creating a Variable

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

name = "Samadhan"
age = 25
course = "Python"

How Variable Assignment Works

Variable Name
name

↓

Assignment Operator
=

↓

Value
"Samadhan"

Printing Variables

Once a value is stored in a variable, we can use the variable name to access that value.

name = "Samadhan"
age = 25

print(name)
print(age)

Output

Samadhan
25

Multiple Variables

Python allows you to create multiple variables in the same program.

name = "Samadhan"
age = 25
salary = 45000.50
is_student = True

Multiple Assignment

Python allows multiple variables to be assigned values in a single statement.

name, age, course = "Samadhan", 25, "Python"

print(name)
print(age)
print(course)

Output

Samadhan
25
Python

Assigning the Same Value

The same value can be assigned to multiple variables.

x = y = z = 100

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

Output:

Output

100
100
100

Checking the Variable Type

The type() function can be used to find the data type of a variable.

name = "Samadhan"
age = 25

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

Output

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

Dynamic Typing in Python

Python is dynamically typed. This means the type of a variable can change when a different type of value is assigned to it.

value = 100

print(value)

value = "Python"

print(value)

Output

100
Python

Variable Naming Rules

Python has some rules that should be followed when creating variable names.

A variable name can contain letters, numbers, and underscores.
A variable name cannot start with a number.
Variable names are case-sensitive.
Spaces should not be used in variable names.
Python keywords should not be used as variable names.

Valid and Invalid Variable Names

Variable	Status	Reason
student_name	Valid	Uses letters and underscore
age25	Valid	Number is not at the beginning
student name	Invalid	Contains a space
25age	Invalid	Starts with a number

Variables are Case-Sensitive

Python treats uppercase and lowercase letters as different characters.

name = "Samadhan"
Name = "CIIT"

print(name)
print(Name)

Output

Samadhan
CIIT

Example 🌍🔓

Let's create variables for a student learning Python at CIIT Training Institute 👀❤️...!.

student_name = "Samadhan"
institute = "CIIT Training Institute 👀❤️...!"
course = "Python Full Stack 🖥️"
experience = 0

print("Student:", student_name)
print("Institute:", institute)
print("Course:", course)
print("Experience:", experience)

Output:

Output

Student: Samadhan
Institute: CIIT Training Institute 👀❤️...!
Course: Python Full Stack 🖥️
Experience: 0

CIIT Learning Point

Use meaningful variable names. A good variable name makes your code easier to understand, maintain, and debug. Prefer names such as student_name instead of unclear names such as x.

CIIT Practice Task

Create variables for your name, age, city, and favorite programming language. Display all the values using print().

name = "Samadhan"
age = 25
city = "Pune"
language = "Python"

print("Name:", name)
print("Age:", age)
print("City:", city)
print("Language:", language)

Output:

Output

Name: Samadhan
Age: 25
City: Pune
Language: Python

Summary :

Variables are used to store and work with data in Python programs. You learned how to create variables, assign multiple values, check variable types, understand dynamic typing, and follow proper variable naming rules. Meaningful variables make Python programs easier to read and maintain.

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