LESSON 6: Loops - while and FOR

🔹 Repeats a block of code as long as the condition is True.

Python Code

count = 1

while count <= 5:

   print("Count is", count)

   count += 1

✅ Try It:

Open Google Colab, create a new notebook, and run the examples above in new code cells.

🔹 break exits the loop early when a condition is met.

Python Code

x = 1

while x < 10:

   if x == 5:

       break

   print(x)

   x += 1

✅ Try It:

Run the examples above in new code cells.

🔹 continue skips the rest of the loop and goes to the next iteration.

Python Code

x = 0

while x < 10:

   x += 1

   if x % 2 == 0:

       continue

   print(x)

✅ Try It:

Run the examples above in new code cells.

🔹 Repeats a block of code a specific number of times. 

Python Code

for i in range(1, 6):

    print(i)

✅ Try It:

Run the examples above in new code cells.

🔹 Loops through items in a list.

Python Code

names = ["Ali", "Bala", "Chan"]

for name in names:

   print(name)

✅ Try It:

Run the examples above in new code cells.

🔹 Loops through each character in a string.

Python Code

word = "hello"

for letter in word:

   print(letter)

✅ Try It:

Run the examples above in new code cells.

🧠 Answer these to test your understanding.

1.  What does continue do in a loop?

2. How many times will this code print a value?

for i in range(3):

   print(i)

🔧 Instructions:

1. Write a program to sum numbers until user enters 0.

2. Write a program to double each number in a list and print.

3. Write a program to print only even numbers between 1 and 20.

You now understand how to:

• Control flow using if, elif, and else

• Repeat tasks using while and for loops

• Use break and continue for more control inside loops

• Iterate through sequences like lists and strings