Loops in Python

Loops in Python

Welcome to the Control Flow lesson! Today, we'll learn about loops in Python, which help your programs repeat actions efficiently.

Loops allow your program to execute a block of code multiple times without having to write the same code repeatedly. They are essential for tasks that require repetition.

• For Loops: Iterate over a sequence of items.
• While Loops: Repeat as long as a condition is true.

The for loop is used to iterate over a sequence (like a list, tuple, or string) and execute a block of code for each item in the sequence.

Syntax:

for item in sequence:
    # code to execute for each item

Let's see how a for loop works with a simple example.

Example:

# Iterates over each fruit in the list and prints it
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

When you run the above code, Python will print each fruit in the list:

apple
banana
cherry

The while loop repeats a block of code as long as a specified condition is true.

Syntax:

apple
banana
cherry

Here's how a while loop works with a simple example.

Example:

# Prints numbers from 1 to 5
count = 1
while count <= 5:
    print(count)
    count += 1  # Increments count by 1

Running the above code will display the numbers 1 through 5.

1
2
3
4
5

You've learned how to use for and while loops to repeat actions in your Python programs. Loops help make your code more efficient and powerful. Keep practicing by creating your own loops and exploring different scenarios!