Python Loop Examples for Beginners

New to Python? This page will help you understand how to repeat actions using loops. Learn how for and while loops work through simple, hands-on examples. You'll also practice important concepts like break, continue, and nested loops.

1. Basic for loop with range
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# Example 1: Basic for loop
for i in range(5):
    print("Iteration:", i)
2. Basic while loop
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# Example 2: Basic while loop
count = 0
while count < 5:
    print("Count is:", count)
    count += 1
3. Using else with for loop
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# Example 3: else with for loop
for i in range(3):
    print("Inside loop:", i)
else:
    print("Loop finished successfully")
4. Using else with while loop
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# Example 4: else with while loop
x = 0
while x < 3:
    print("x =", x)
    x += 1
else:
    print("While loop ended")
5. Break in a loop
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# Example 5: Using break
for i in range(10):
    if i == 5:
        break
    print(i)
6. Continue in a loop
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# Example 6: Using continue
for i in range(5):
    if i == 2:
        continue
    print(i)
7. Infinite loop with break
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# Example 7: Infinite loop
while True:
    print("This prints once")
    break
8. Nested for loops
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# Example 8: Nested loops
for i in range(2):
    for j in range(3):
        print(f"i={i}, j={j}")
9. Countdown using while loop
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# Example 9: Countdown
n = 5
while n > 0:
    print(n)
    n -= 1
print("Liftoff!")
10. Sum of numbers using for loop
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# Example 10: Sum of numbers
total = 0
for num in range(1, 6):
    total += num
print("Total sum:", total)
11. Factorial using while loop
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# Example 11: Factorial
n = 5
factorial = 1
while n > 0:
    factorial *= n
    n -= 1
print("Factorial is", factorial)
12. Multiplication table using for loop
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# Example 12: Multiplication table
num = 4
for i in range(1, 11):
    print(f"{num} x {i} = {num * i}")
13. Print even numbers using for loop
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# Example 13: Print even numbers from 1 to 10
for i in range(1, 11):
    if i % 2 == 0:
        print(i)
14. Print odd numbers using while loop
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# Example 14: Print odd numbers from 1 to 10
n = 1
while n <= 10:
    if n % 2 != 0:
        print(n)
    n += 1
15. Calculate square of numbers
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# Example 15: Square of numbers from 1 to 5
for i in range(1, 6):
    print(f"{i} squared is {i ** 2}")
16. Countdown with message
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# Example 16: Countdown timer
seconds = 3
while seconds > 0:
    print(f"{seconds}...")
    seconds -= 1
print("Time's up!")
17. Print a triangle pattern
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# Example 17: Triangle pattern
rows = 5
for i in range(1, rows + 1):
    print("*" * i)
18. Sum of even numbers using while loop
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# Example 18: Sum of even numbers from 1 to 10
total = 0
n = 1
while n <= 10:
    if n % 2 == 0:
        total += n
    n += 1
print("Total even sum:", total)
19. Reverse loop with for
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# Example 19: Count backward using for
for i in range(10, 0, -1):
    print(i)
20. Print multiples of a number
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# Example 20: Multiples of 3 from 1 to 30
for i in range(1, 31):
    if i % 3 == 0:
        print(i)
21. Print numbers skipping last 2
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# Example 21: Skip last two numbers in range
for i in range(1, 11):
    if i > 8:
        break
    print(i)
22. Skip numbers divisible by 3
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# Example 22: Skip numbers divisible by 3
for i in range(1, 11):
    if i % 3 == 0:
        continue
    print(i)
23. Loop to find first number divisible by 7
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# Example 23: Find first number divisible by 7
num = 1
while True:
    if num % 7 == 0:
        print("First divisible by 7:", num)
        break
    num += 1
24. Simple login simulation
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# Example 24: Login attempt simulation
password = "admin"
attempts = 0
while attempts < 3:
    guess = input("Enter password: ")
    if guess == password:
        print("Access granted")
        break
    else:
        print("Wrong password")
    attempts += 1
else:
    print("Account locked")
25. Print ASCII values of characters
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# Example 25: ASCII values
for ch in range(65, 71):
    print(f"Character: {chr(ch)}, ASCII: {ch}")
26. Sum of digits of a number
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# Example 26: Sum of digits
number = 1234
sum_digits = 0
while number > 0:
    sum_digits += number % 10
    number //= 10
print("Sum of digits:", sum_digits)
27. Check if a number is prime
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# Example 27: Prime number check
num = 7
is_prime = True
for i in range(2, num):
    if num % i == 0:
        is_prime = False
        break
if is_prime:
    print("Prime number")
else:
    print("Not a prime number")
28. Print numbers in reverse using while loop
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# Example 28: Reverse with while loop
n = 5
while n >= 1:
    print(n)
    n -= 1
29. Calculate cube of numbers
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# Example 29: Cube of numbers
for i in range(1, 6):
    print(f"{i} cubed is {i ** 3}")
30. Print numbers from 1 to 100 divisible by both 3 and 5
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# Example 30: Divisible by 3 and 5
for i in range(1, 101):
    if i % 3 == 0 and i % 5 == 0:
        print(i)
31. Print digits in reverse order
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# Example 31: Reverse digits
num = 123
while num > 0:
    digit = num % 10
    print(digit)
    num //= 10
32. Print a rectangle pattern
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# Example 32: Rectangle of stars
rows = 3
cols = 5
for i in range(rows):
    print("*" * cols)
33. Calculate power without using ** operator
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# Example 33: Power using loop
base = 2
exp = 3
result = 1
for _ in range(exp):
    result *= base
print("Result:", result)
34. Count digits in a number
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# Example 34: Count digits
num = 7890
count = 0
while num != 0:
    num //= 10
    count += 1
print("Number of digits:", count)
35. Print multiplication table vertically
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# Example 35: Vertical multiplication
for i in range(1, 6):
    for j in range(1, 6):
        print(f"{i*j}", end="\t")
    print()
36. Sum of first N natural numbers
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# Example 36: Sum of N numbers
n = 10
total = 0
for i in range(1, n + 1):
    total += i
print("Sum:", total)

What’s Next?

Great job learning how loops work in Python! Next, let’s take a look at how to use loops with different data structures like lists, Tuples, and more. This will help you write more powerful and flexible code using loops and collections together.