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🚀 Data Science Roadmap 2026

📘 Phase 1: Programming Fundamentals

🐍 Topic 4: Python Conditional Statements (if, elif, else)

Welcome back! 👋

In the previous lesson, you learned how to take input from users and display output. Now it's time to learn how Python makes decisions.

Conditional statements allow a program to execute different blocks of code based on whether a condition is True or False.

They are one of the most important concepts in Python and are used extensively in Data Science, Machine Learning, and real-world applications.

🔹 1. What are Conditional Statements?

Conditional statements help Python decide which code should run based on a condition.

Think of it like making everyday decisions:

• If it's raining → Carry an umbrella.

• Else → Wear sunglasses.

Similarly, Python checks a condition and decides what to execute.

🔹 2. The "if" Statement

The "if" statement executes a block of code only if the condition is True.

Syntax

if condition:
    # Code to execute

Example

age = 20
if age >= 18:
    print("Eligible to vote")

Output

Eligible to vote

🔹 3. The "if...else" Statement

Use "else" when you want to execute another block if the condition is False.

Example

age = 16
if age >= 18:
    print("Eligible to vote")
else:
    print("Not eligible to vote")

Output

Not eligible to vote

🔹 4. The "if...elif...else" Statement ⭐

Use "elif" when you need to check multiple conditions.

Example

marks = 85
if marks >= 90:
    print("Grade A")
elif marks >= 75:
    print("Grade B")
elif marks >= 60:
    print("Grade C")
else:
    print("Grade D")

Output

Grade B

Python checks conditions from top to bottom and executes the first condition that is True.

🔹 5. Nested "if" Statements

You can place one "if" statement inside another.

Example

age = 25
citizen = True
if age >= 18:
    if citizen:
        print("Eligible to vote")

Output

Eligible to vote

🔹 6. Using Logical Operators

Conditional statements often use logical operators.

"and"

age = 25
if age >= 18 and age <= 60:
    print("Working Age")

"or"

marks = 35
if marks >= 40 or marks == 35:
    print("Eligible for Grace Marks")

"not"

is_holiday = False
if not is_holiday:
    print("Go to Office")

🔹 7. Checking Multiple Conditions

salary = 60000
experience = 4
if salary > 50000 and experience >= 3:
    print("Eligible for Promotion")
else:
    print("Not Eligible")

🔹 8. Ternary Operator ⭐

A shorter way to write an "if...else" statement.

Syntax

value_if_true if condition else value_if_false

Example

age = 20
status = "Adult" if age >= 18 else "Minor"
print(status)

Output

Adult

🔹 9. Real-World Example

temperature = 38
if temperature > 35:
    print("It's a hot day.")
elif temperature >= 20:
    print("Weather is pleasant.")
else:
    print("It's cold.")

🔹 10. Common Mistakes

❌ Missing Colon

if age >= 18
    print("Eligible")

This gives a SyntaxError.

Correct:

if age >= 18:
    print("Eligible")

❌ Incorrect Indentation

if age >= 18:
print("Eligible")

Python requires proper indentation.

Correct:

if age >= 18:
    print("Eligible")

🔹 11. Real-World Data Science Example

prediction = 0.82
if prediction >= 0.5:
    print("Spam Email")
else:
    print("Not Spam")

Many Machine Learning classification models use similar logic to convert prediction probabilities into categories.

🎯 Practice Questions

1. Check whether a number is positive or negative.

2. Check whether a person is eligible to vote.

3. Create a grading system using "if...elif...else".

4. Check whether a number is even or odd.

5. Determine the largest of three numbers.

🎯 Key Takeaways

✅ Use "if" to execute code when a condition is True.

✅ Use "else" to execute code when the condition is False.

✅ Use "elif" to check multiple conditions.

✅ Nested "if" statements allow more complex decision-making.

✅ Logical operators (and, or, not) help combine conditions.

✅ The ternary operator provides a concise way to write simple "if...else" statements.

Conditional statements are the foundation of decision-making in Python and are widely used in automation, data analysis, machine learning, and AI applications.

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🚀 Data Science Roadmap 2026

📘 Phase 1: Programming Fundamentals

🐍 Topic 5: Python Loops ("for" & "while")

Welcome back! 👋

In the previous lesson, you learned how Python makes decisions using if, elif, and else. Now it's time to learn how to repeat tasks automatically using loops.

Loops are one of the most powerful concepts in Python. Instead of writing the same code multiple times, you can use loops to execute a block of code repeatedly.

In Data Science, loops are commonly used to process datasets, automate repetitive tasks, iterate through lists, and build machine learning workflows.

🔹 1. What is a Loop?

A loop is used to execute a block of code multiple times until a condition is met.

Without loops:

print("Hello")
print("Hello")
print("Hello")
print("Hello")
print("Hello")

Using a loop:

for i in range(5):
    print("Hello")

Both produce the same output, but the loop is much shorter and easier to maintain.

🔹 2. Types of Loops in Python

Python provides two main types of loops:

✅ "for" Loop

✅ "while" Loop

🔹 3. The "for" Loop ⭐

A "for" loop is used when you know how many times you want to repeat a task.

Syntax

for variable in sequence:
    # Code to execute

Example

for i in range(5):
    print(i)

Output:

0  
1  
2  
3  
4

Notice that range(5) generates numbers from 0 to 4.

🔹 4. The "range()" Function ⭐

The range() function generates a sequence of numbers.

Example 1

for i in range(5):
    print(i)

Output: 0 1 2 3 4

Example 2

for i in range(1, 6):
    print(i)

Output: 1 2 3 4 5

Example 3

for i in range(2, 11, 2):
    print(i)

Output: 2 4 6 8 10

The third argument is called the step size.

🔹 5. Looping Through a List

fruits = ["Apple", "Banana", "Mango"]

for fruit in fruits:
    print(fruit)

Output:

Apple  
Banana  
Mango

🔹 6. The "while" Loop ⭐

A "while" loop continues executing as long as the condition remains True.

Syntax

while condition:
    # Code

Example

count = 1

while count <= 5:
    print(count)
    count += 1

Output: 1 2 3 4 5

🔹 7. Infinite Loop

Be careful when using "while" loops.

while True:
    print("Hello")

This loop never stops unless interrupted.

Always ensure the condition eventually becomes False.

🔹 8. Loop Control Statements ⭐

"break" - Stops the loop immediately

for i in range(10):
    if i == 5:
        break
    print(i)

Output: 0 1 2 3 4

"continue" - Skips the current iteration

for i in range(5):
    if i == 2:
        continue
    print(i)

Output: 0 1 3 4

"pass" - Acts as a placeholder

for i in range(5):
    pass

Useful when writing incomplete code.

🔹 9. Nested Loops

A loop inside another loop.

for i in range(3):
    for j in range(2):
        print(i, j)

Output:

0 0  
0 1  
1 0  
1 1  
2 0  
2 1

🔹 10. Real-World Data Science Example

Calculate the total sales.

sales = [1000, 2000, 1500, 3000]

total = 0

for amount in sales:
    total += amount

print(total)

Output: 7500

🔹 11. Common Mistakes 

❌ Forgetting to update the loop variable

count = 1
while count <= 5:
    print(count)

This creates an infinite loop because count never changes.

Correct:

count = 1
while count <= 5:
    print(count)
    count += 1

🎯 Practice Questions 

1. Print numbers from 1 to 10 using a "for" loop

2. Print even numbers from 2 to 20

3. Find the sum of numbers from 1 to 100

4. Print all elements of a list using a loop

5. Create a multiplication table of any number using a "for" loop

🎯 Key Takeaways

✅ Use a "for" loop when the number of iterations is known

✅ Use a "while" loop when the number of iterations depends on a condition

✅ range() generates sequences of numbers

✅ break exits the loop immediately

✅ continue skips the current iteration

✅ pass acts as a placeholder

Loops are one of the most important concepts in Python. You'll use them extensively for data processing, feature engineering, machine learning, automation, and solving coding interview questions.

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🚀 Data Science Roadmap 2026

📘 Phase 1: Programming Fundamentals

🐍 Topic 6: Python Functions
 
So far, you've learned variables, operators, input/output, conditional statements, and loops. As your programs grow larger, writing the same code repeatedly becomes inefficient. That's where functions come in. 

A function is a reusable block of code that performs a specific task. Functions make your code cleaner, easier to maintain, and reusable. 

Functions are heavily used in Data Science, Machine Learning, and AI because they allow you to organize complex workflows into smaller, manageable pieces.

🔹 1. What is a Function? 
A function is a named block of code that executes only when it is called. 

Instead of writing the same logic multiple times, you write it once inside a function and reuse it whenever needed. 

Example

def greet():
    print("Welcome to Data Science!")

greet()

Output 

Welcome to Data Science!

🔹 2. Why Do We Use Functions? 

Functions help you: 
✅ Avoid writing duplicate code 
✅ Improve code readability 
✅ Make debugging easier 
✅ Reuse code in multiple places 
✅ Build modular applications 

🔹 3. Defining a Function 

Syntax

def function_name():
    # Function body

Example:

def welcome():
    print("Hello, World!")

welcome()

🔹 4. Function Parameters 
Parameters allow you to pass information into a function.

def greet(name):
    print("Hello", name)

greet("Deepak")

Output 

Hello Deepak 

Here, "name" is called a parameter.

🔹 5. Function Arguments 
When calling a function, the values you pass are called arguments.

def square(number):
    print(number * number)

square(5)

Output 

25 

Here: 
• "number" → Parameter
• "5" → Argument

🔹 6. Returning Values 
A function can return a value using the return keyword.

def add(a, b):
    return a + b

result = add(10, 20)
print(result)

Output 

30 

Using return allows the function's result to be stored or used later.

🔹 7. Default Parameters 
You can assign default values to parameters.

def greet(name="Guest"):
    print("Hello", name)

greet()
greet("Rahul")

Output

Hello Guest
Hello Rahul

🔹 8. Multiple Return Values 
A function can return more than one value.

def calculate(a, b):
    return a + b, a * b

sum_value, product = calculate(4, 5)
print(sum_value)
print(product)

Output

9
20

🔹 9. Scope of Variables 
Variables created inside a function are called local variables.

def demo():
    message = "Inside Function"
    print(message)

demo()

Trying to access

message

outside the function will produce an error because it exists only inside the function.

🔹 10. Built-in Functions 
Python provides many ready-to-use functions. 

Examples:

numbers = [5, 2, 8, 1]
print(len(numbers))
print(max(numbers))
print(min(numbers))
print(sum(numbers))

Output

4
8
1
16

🔹 11. Real-World Data Science Example 
Calculate the average marks of students.

def average(marks):
    return sum(marks) / len(marks)

scores = [80, 75, 92, 88]
print(average(scores))

Output 

83.75 

Functions like this are commonly used while cleaning data, calculating statistics, and building machine learning pipelines.

🔹 12. Common Mistakes 
❌ Forgetting to Call the Function

def greet():
    print("Hello")

# Nothing happens because the function isn't called.

Correct:

greet()

❌ Forgetting to Return a Value

def add(a, b):
    a + b

# Correct:
def add(a, b):
    return a + b

🎯 Practice Questions 
1. Write a function to add two numbers.
2. Create a function to calculate the square of a number.
3. Write a function that checks whether a number is even or odd.
4. Create a function to calculate the average of a list.
5. Write a function that returns the largest of three numbers.

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