Python! Loops For and While | Lectures 6

Lets Start Python Programming For Beginners to advanced. Loops – For and While, Lectures 6

🐍 Lecture 6: Loops – For and While

🎯 Goal

By the end of this lecture, you will:

• Understand what loops are and why they’re useful.
• Be able to use for loops to repeat actions a set number of times.
• Use while loops to repeat actions while a condition is true.
• Build fun programs like counters, timers, and simple games.

🧠 What Are Loops?

A loop lets you repeat code many times — just like doing something over and over again!

🔁 Imagine you’re jumping rope:

• You jump once → one line of code.
• You jump 10 times → one loop that runs 10 times.

In Python, there are two main types of loops:

• for loop → repeats a specific number of times
• while loop → repeats as long as a condition is true

🔁 for Loop – Repeat a Certain Number of Times

Syntax:

for i in range(5):
    print("Jump!")

Output:

Jump!
Jump!
Jump!
Jump!
Jump!

👉 range(5) means “do it 5 times”. You can change the number inside to do it more or less.

Example: Counting from 1 to 5

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

👉 Output:

1
2
3
4
5

🧒 Kids Corner: Think of a for loop like eating cookies — one by one until they’re all gone!

🔄 while Loop – Repeat While Something Is True

A while loop keeps going until something changes.

Syntax:

count = 1
while count <= 5:
    print("Count:", count)
    count += 1

👉 Output:

Count: 1
Count: 2
Count: 3
Count: 4
Count: 5

This loop says:

• As long as count is less than or equal to 5 → keep looping.
• Each time, increase count by 1 (count += 1).

⚠️ Be careful not to make an infinite loop (a loop that never stops!).

🛑 Breaking Out of a Loop Early – break

You can stop a loop anytime using break.

Example:

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

👉 This will print numbers from 0 to 4, then stop.

🧪 Try It Yourself!

Write a program that counts from 1 to 10 using both:

• A for loop
• A while loop

💡 Sample Code:

# Using for loop
print("Using for loop:")
for i in range(1, 11):
    print(i)

# Using while loop
print("\nUsing while loop:")
count = 1
while count <= 10:
    print(count)
    count += 1

🎮 Mini Project: Countdown Timer

Let’s build a countdown timer from 10 to 1, then say “Blast off!” at the end.

print("🚀 Countdown Timer")
for i in range(10, 0, -1):
    print(i)
print("Blast off! 🌌")

👉 Output:

10
9
8
7
6
5
4
3
2
1
Blast off! 🌌

📝 Note: range(10, 0, -1) means start at 10, go down to 1.

🧒 Kids Corner

🧠 Imagine you’re on a swing — you go back and forth again and again.
That’s what a loop does — it makes your code swing through the same steps until it’s done.

Back and forth, again and again — that’s a loop!

🚀 Challenge (Optional)

Make a password guessing game where the user has to guess a secret password.

Example:

password = ""
while password != "secret":
    password = input("Enter the password: ")
    if password == "secret":
        print("Access granted! 🎉")
    else:
        print("Wrong password. Try again.")

📌 Summary

• Use for loops when you know how many times to repeat.
• Use while loops when you want to repeat until something changes.
• Avoid infinite loops unless you have a way to break out using break.
• Loops help you write short code that does big things!

Python Programming For Beginners To Advanced

Python Programming For Beginners! Lecture 1

Python Programming! Variables and Data Types | Lectures 2

Python Programming! Input And Output | Lectures 3

Python Programming! Operators in Python Lectures 4

Python Programming! Conditional Statements Lectures 5

Python! Loops For and While | Lectures 6

Python! Building A Mini Game | Lectures 7