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num1 = int(input("Enter first number: "))
num2 = int(input("Enter second number: "))
print(num1 + num2)

Output:

30

🔹 12. Real-World Example

salary = float(input("Enter your monthly salary: "))
annual_salary = salary * 12
print(f"Your annual salary is {annual_salary}")

🎯 Practice Questions 

1. Take your name as input and print a welcome message. 

2. Take two integers as input and print their sum. 

3. Take a student's marks as input and print them using an f-string. 

4. Take the radius of a circle as input and calculate the area. 

5. Take your birth year as input and calculate your approximate age. 

🎯 Key Takeaways

✅ Use print() to display output

✅ Use input() to accept user input

✅ input() always returns a string

✅ Convert input using int() or float() when needed

✅ Use f-strings for clean and readable output formatting 

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🚀 Data Science Roadmap 2026

📘 Phase 1: Programming Fundamentals

🐍 Topic 3: Python Input & Output

In the previous lesson, you learned about Python Operators. Now it's time to learn how Python interacts with users by taking input and displaying output.

Input and Output (I/O) are fundamental concepts because almost every real-world program accepts input, processes it, and produces meaningful output.

🔹 1. What is Input & Output?

A Python program generally follows three steps:

Input → Process → Output

Example:

• User enters two numbers Input

• Python adds them Process

• Sum is displayed Output

🔹 2. Displaying Output

Python uses the print() function to display information on the screen.

Example

print("Hello, Data Science!")

Output

Hello, Data Science!

🔹 3. Printing Variables

You can print variables along with text.

name = "Deepak"
print(name)

Output:

Deepak

Or:

name = "Deepak"
print("Welcome", name)

Output:

Welcome Deepak

🔹 4. Taking User Input

Python uses the input() function to receive input from users.

name = input("Enter your name: ")
print("Hello", name)

Example Output:

Enter your name: Deepak
Hello Deepak

🔹 5. Important Note ⭐

The input() function always returns a string, even if the user enters a number.

age = input("Enter age: ")
print(type(age))

Output:

<class 'str'>

🔹 6. Converting Input to Integer

To perform mathematical operations, convert the input using int().

age = int(input("Enter your age: "))
print(age + 5)

Example:

Enter your age: 25
30

🔹 7. Taking Decimal Input

Use float() for decimal numbers.

price = float(input("Enter price: "))
print(price)

🔹 8. Taking Multiple Inputs

You can take multiple inputs in a single line.

name, city = input("Enter your name and city: ").split()
print(name)
print(city)

Example Input:

Deepak Mumbai

Output:

Deepak
Mumbai

🔹 9. Formatting Output

Using f-Strings ⭐ Recommended

name = "Deepak"
age = 25
print(f"My name is {name} and I am {age} years old.")

Output:

My name is Deepak and I am 25 years old.

Using .format()

name = "Deepak"
print("Welcome {}".format(name))

🔹 10. Example Program

name = input("Enter your name: ")
age = int(input("Enter your age: "))

print(f"Hello {name}")
print(f"Next year you will be {age + 1} years old.")

Example Output:

Enter your name: Deepak
Enter your age: 25
Hello Deepak
Next year you will be 26 years old.

🔹 11. Common Mistake

num1 = input("Enter first number: ")
num2 = input("Enter second number: ")
print(num1 + num2)

Input:

10
20

Output:

1020

Why?

Because both values are strings.

Correct way:

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result = 10 + 5 * 2
print(result)

Output:

20  

Multiplication is performed before addition.

Use parentheses to change the order.

result = (10 + 5) * 2
print(result)

Output:

30

🔹 10. Real-World Example

salary = 60000
bonus = 5000
total_salary = salary + bonus
is_high_salary = total_salary > 50000
print(total_salary)
print(is_high_salary)

Output:

65000  
True

🎯 Key Takeaways

✅ Operators perform calculations and comparisons.

✅ Arithmetic operators are used for mathematical operations.

✅ Comparison operators return True or False.

✅ Logical operators help combine multiple conditions.

✅ Membership operators check if a value exists in a sequence.

✅ Identity operators check whether two variables refer to the same object. 

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🚀 Data Science Roadmap 2026

📘 Phase 1: Programming Fundamentals

🐍 Topic 2: Python Operators

In the previous lesson, you learned about Variables & Data Types. Now it's time to learn how Python performs calculations, comparisons, and logical operations using operators.

Operators are one of the most fundamental concepts in Python. You'll use them in almost every program, from simple calculations to complex Machine Learning algorithms.

🔹 1. What are Operators?

Operators are special symbols used to perform operations on variables and values.

Example:

a = 10
b = 5
print(a + b)

Output:

15  

Here, "+" is an operator that adds two numbers.

🔹 2. Types of Operators in Python

Python has several types of operators:

✅ Arithmetic Operators

✅ Comparison Operators

✅ Assignment Operators

✅ Logical Operators

✅ Membership Operators

✅ Identity Operators

🔹 3. Arithmetic Operators ⭐

Used for mathematical calculations.

Operators:

• ** + Addition**: 10 + 5 = 15

• - Subtraction: 10 - 5 = 5

• ** Multiplication*: 10 * 5 = 50

• / Division: 10 / 5 = 2.0

• // Floor Division: 10 // 3 = 3

• % Modulus (Remainder): 10 % 3 = 1

• ** Exponent: 2 ** 3 = 8

Example:

a = 10
b = 3
print(a + b)
print(a - b)
print(a * b)
print(a / b)
print(a // b)
print(a % b)
print(a ** b)

🔹 4. Comparison Operators ⭐

Used to compare two values. The result is always True or False.

Operators:

• == Equal to

• != Not Equal to

• > Greater than

• < Less than

• >= Greater than or Equal to

• <= Less than or Equal to

Example:

x = 20
y = 10
print(x > y)
print(x == y)
print(x != y)

Output:

True  
False  
True

🔹 5. Assignment Operators

Used to assign values to variables.

x = 10
x += 5
print(x)

Output:

15

Other assignment operators:

x -= 2  
x *= 3  
x /= 2

🔹 6. Logical Operators ⭐

Used to combine multiple conditions.

and

Returns True only if both conditions are True.

age = 25
print(age > 18 and age < 30)

Output:

True

or

Returns True if at least one condition is True.

print(age < 18 or age < 30)

Output:

True

not

Reverses the result.

print(not(age > 18))

Output:

False

🔹 7. Membership Operators

Used to check whether a value exists in a sequence.

in

fruits = ["Apple", "Banana", "Mango"]
print("Apple" in fruits)

Output:

True

not in

print("Orange" not in fruits)

Output:

True

🔹 8. Identity Operators

Used to check whether two variables refer to the same object.

is

a = [1, 2]
b = a
print(a is b)

Output:

True

is not

x = [1, 2]
y = [1, 2]
print(x is not y)

Output:

True

🔹 9. Operator Precedence

Python follows the PEMDAS/BODMAS rule while evaluating expressions.

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<class 'int'>

🔹 11. Type Conversion (Casting)

Sometimes you need to convert one data type into another.

String → Integer

age = "25"
print(int(age))

Integer → Float

marks = 95
print(float(marks))

Float → Integer

price = 199.99
print(int(price)) # Output: 199

Integer → String

number = 100
print(str(number))

🔹 12. Multiple Variable Assignment

Assign multiple variables in one line.

x, y, z = 10, 20, 30

Assign the same value to multiple variables.

a = b = c = 100

🔹 13. Dynamic Typing

Python is dynamically typed.

This means a variable can store different data types at different times.

x = 10
x = "Data Science"
print(x) 
# Output: Data Science

🔹 14. Best Practices

✅ Use meaningful variable names.

student_name = "Rahul"
monthly_salary = 50000

Instead of:

a = "Rahul"
b = 50000

Follow the snake_case naming convention.

Examples: customer_name, total_sales, average_salary

🔹 15. Real-World Example

name = "Rohit"
age = 25
salary = 65000.50
is_employee = True

print(name)
print(age)
print(salary)
print(is_employee)

Output:

Rohit
25
65000.5
True

🎯 Key Takeaways

✅ Variables are used to store data.

✅ Python automatically detects data types.

✅ The most common data types are: int, float, str, bool, complex

✅ Use type() to check a variable's data type.

✅ Use meaningful variable names and follow the snake_case naming convention.

Mastering variables and data types is the first step toward becoming a successful Data Scientist. Every machine learning model, data analysis project, and AI application starts with understanding how data is stored and managed in Python.

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🚀 Data Science Roadmap 2026

📘 Phase 1: Programming Fundamentals

🐍 Topic 1: Python Basics – Variables & Data Types

Welcome to the Complete Data Science Roadmap! 🎉

Over the coming lessons, we'll learn everything you need to become a job-ready Data Scientist—from Python and SQL to Machine Learning, Deep Learning, Generative AI, and MLOps.

Today, we're starting with the first and most important topic of the roadmap: Python Basics – Variables & Data Types.

Python is the most widely used programming language in Data Science because it is easy to learn, highly readable, and supported by powerful libraries such as NumPy, Pandas, Matplotlib, Scikit-learn, TensorFlow, and PyTorch.

Before building machine learning models or analyzing data, you must understand how Python stores and manages data. Every Python program begins with variables and data types, making them the foundation of your Data Science journey.

🔹 1. What is Python?

Python is a high-level, interpreted programming language used for:

✅ Data Science

✅ Machine Learning

✅ Artificial Intelligence

✅ Data Analysis

✅ Automation

✅ Web Development

🔹 2. What is a Variable?

A variable is a named container used to store data in memory.

Think of a variable like a labeled box. You store information inside the box, and whenever you need that information later, you simply use the label (variable name).

For example:

name = "Aman"
age = 25
salary = 175000

Here:

• "name" stores a string.

• "age" stores an integer.

• "salary" stores a numeric value.

🔹 3. Rules for Naming Variables

✅ Valid Rules

• Must begin with a letter or underscore ("_")

• Can contain letters, numbers, and underscores

• Variable names are case-sensitive

Examples:

student_name = "Rahul"
marks = 90
age2 = 24

❌ Invalid Examples

2name = "Rahul"
student name = "Rahul"
class = 10

Why?

• Cannot start with a number

• Spaces are not allowed

• "class" is a reserved Python keyword

🔹 4. What are Data Types?

A data type tells Python what kind of value a variable stores.

Python automatically detects the data type when you assign a value.

Data Types in Python:

int: Whole numbers Example: 25

float : Decimal numbers Example: 99.99

str: Text

Example: "Python"

bool: True or False

complex: Complex numbers

Example: 3+4j

🔹 5. Integer (int)

Stores whole numbers.

age = 25
print(age)
print(type(age))

Output:

25
<class 'int'>

🔹 6. Float (float)

Stores decimal numbers.

price = 199.99
print(price)
print(type(price))

Output:

199.99
<class 'float'>

🔹 7. String (str)

Stores text.

name = "Suresh"
print(name)
print(type(name))

Output:

Deepak
<class 'str'>

Strings can be written using either single (' ') or double (" ") quotes.

🔹 8. Boolean (bool)

Boolean values are used for decision-making.

They can store only two values: True or False

is_student = True
print(type(is_student))

Output:

<class 'bool'>

🔹 9. Complex Numbers

Python also supports complex numbers.

number = 3 + 4j
print(type(number))

Output:

<class 'complex'>

Although rarely used in Data Science, they are useful in scientific and mathematical computations.

🔹 10. Checking the Data Type

Use the type() function.

salary = 50000
print(type(salary))

Output: