🔰 Introduction :
In programming, we often need to repeat the same code multiple times. For example:
Printing numbers from 1 to 10.
Checking elements in a list.
Repealing a game until the player loses.
Instead of manually repeating the code, we use for and while loops.
🌀 First: The for loop
✅ General form :
Python
for a variable in an array:
# Iterate code
📦 The most famous example – using range():
Python
for i in range(5):
print(i)
📌 Result :
0
1
2
3
4
🔎 range(5) means: from 0 to 4 (5 not included).
🔁 Printing numbers from 1 to 10 :
Python
for i in range(1, 11):
print(i)
🪄 Simple exercise :
Write code that prints the sentence “Hello!” Five times:
Python
for i in range(5):
print(“Hello!”)
🧮 Practical example: Multiplication table
Python
number = int(input(“Pick a number: “))
for i in range(1, 11):
print(number, “x”, i, “=”, number * i)
🔄 Second: The while loop
✅ General form :
Python
while condition:
# code that repeats
📌 The while is used when you don’t know the number of iterations in advance.
⏳ Simple example :
Python
i = 1
while i <= 5:
print(“Repeat number”, i)
i += 1
⚠️ Important warning :
Beware of infinite loops! If you forget to update the condition inside the while statement, it will run forever:
python
# This code will not stop!
while True:
print(“Always on”)
🧪 Exercise 1 :
Ask the user for a password, and repeat the request until they type it correctly:
python
password = “”
while password != “python123”:
password = input(“Enter password: “)
print(“Login successful!”)
🔁 Exercise 2 :
Write code that asks the user for a number, then prints from 1 up to that number:
python
n = int(input(“Enter a number: “))
for i in range(1, n + 1):
print(i)
🔄 The difference between for and while
The for loop property while loop
The number of iterations is known Yes No Always
Usage: Lists, range(), defined iterations, conditional conditions, loops of unknown duration
📝 Summary :
You have learned to use for and while to repeat commands.
You have understood the difference between loops.
I used range() and tried practical examples.
📌 What will we learn in Lesson 5 ?
In the next lesson, we’ll learn how to organize code using functions. You’ll be able to reuse code in a smarter, more professional way.
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