For and While Loops

For Loop

Iterating Over a Range

# Print 0 to 4
for i in range(5):
    print(i)
Print 1 to 5
for i in range(1, 6):
    print(i)
Print 0, 2, 4, 6, 8
for i in range(0, 10, 2):
    print(i)

Iterating Over a List

fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

While Loop

count = 0
while count < 5:
    print(count)
    count += 1

Loop Control

Break

for i in range(10):
    if i == 5:
        break
    print(i)  # Prints 0,1,2,3,4

Continue

for i in range(5):
    if i == 2:
        continue
    print(i)  # Prints 0,1,3,4 (skips 2)

Enumerate

fruits = ["apple", "banana", "cherry"]
for index, fruit in enumerate(fruits):
    print(f"{index}: {fruit}")
0: apple
1: banana
2: cherry

List Comprehension

# Create a list of squares
squares = [x2 for x in range(10)]
print(squares)  # [0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

Summary

• For loops: iterate over sequences
• While loops: repeat while condition is True
• Break: exit the loop
• Continue: skip to next iteration
• List comprehension: create lists concisely

Next Lesson

In the next lesson, you'll learn about lists and tuples.