Python if else, for loop, and range() Exercise with Solutions

To decide or to control the flow of a program, we have branching and Looping techniques in Python. To perform decision making, we use the if-else statement in Python. To iterate over a sequence of elements we use for loop, and when we want to iterate a block of code repeatedly as long as the condition is true we use the while loop.

We often use a loop, and if-else statement in our program, so a good understanding of it is necessary. This Python loop exercise aims to help Python developers to learn and practice if-else conditions, for loop, range() function, and while loop. All questions are tested on Python 3.

What included in this Python loop exercise?

The exercise contains 18 questions and solutions provided for each question. This loop coding exercise is nothing but Python for loop and while loop assignments to solve, where you can solve and practice different looping techniques programs, questions, problems, and challenges.

This Python loop exercise covers questions on the following topics:

• Python for loop and while loop
• Python nested if-else and nested loop
• Break, continue and pass statement

When you complete each question, you get more familiar with the if-else conditions, for loop, and while loop. Let us know if you have any alternative solutions. It will help other developers.

Use Online Code Editor to solve exercise questions.

Exercise Question 1: Print First 10 natural numbers using while loop

Expected output:

0
1
2
3
4
5
6
7
8
9
10

i = 0
while i <= 10:
    print(i)
    i += 1

Exercise Question 2: Print the following pattern

1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5

print("Second Number Pattern ")
lastNumber = 6
for row in range(1, lastNumber):
    for column in range(1, row + 1):
        print(column, end=' ')
    print("")

Exercise Question 3: Accept number from user and calculate the sum of all number between 1 and given number

For example user given 10 so the output should be 55

sum1 = 0
n = int(input("Please enter number "))
for i in range(1, n + 1, 1):
    sum1 += i
print("\n")
print("Sum is: ", sum1)

Exercise Question 4: Print multiplication table of given number

For example num = 2 so the output should be

2
4
6
8
10
12
14
16
18
20

n = 2
for i in range(1, 11, 1):
    product = n*i
    print(product)

Exercise Question 5: Given a list iterate it and display numbers which are divisible by 5 and if you find number greater than 150 stop the loop iteration

list1 = [12, 15, 32, 42, 55, 75, 122, 132, 150, 180, 200]

Expected output:

15
55
75
150

list1 = [12, 15, 32, 42, 55, 75, 122, 132, 150, 180, 200]
for item in list1:
    if (item > 150):
        break
    if(item % 5 == 0):
        print(item)

Exercise Question 6: Given a number count the total number of digits in a number

For example, the number is 75869, so the output should be 5.

num = 75869
count = 0
while num != 0:
    num //= 10
    count+= 1
print("Total digits are: ", count)

Exercise Question 7: Print the following pattern using for loop

5 4 3 2 1 
4 3 2 1 
3 2 1 
2 1 
1

n = 5
k = 5
for i in range(0,n+1):
    for j in range(k-i,0,-1):
        print(j,end=' ')
    print()

Exercise Question 8: Reverse the following list using for loop

list1 = [10, 20, 30, 40, 50]

Expected output:

50
40
30
20
10

list1 = [10, 20, 30, 40, 50]
start = len(list1) - 1
stop = -1
step = -1
for i in range(start, stop, step) :
    print(list1[i])

Exercise Question 9: Display -10 to -1 using for loop

Expected output:

-10
-9
-8
-7
-6
-5
-4
-3
-2
-1

for num in range(-10, 0, 1):
    print(num)

Exercise Question 10: Display a message “Done” after successful execution of for loop

For example, the following loop will execute without any error.

for i in range(5):
    print(i)

So the Expected output should be:

0
1
2
3
4
Done!

for i in range(5):
    print(i)
else:
    print("Done!")

Exercise Question 11: Python program to display all the prime numbers within a range

Note: A Prime Number is a whole number that cannot be made by multiplying other whole numbers

Examples:

• 6 is not a Prime Number because it can be made by 2×3 = 6
• 37 is a Prime Number because no other whole numbers multiply together to make it.

Given:

start = 25
end = 50

Expected output:

Prime numbers between 25 and 50 are:
29
31
37
41
43
47

start = 25
end = 50
print("Prime numbers between", start, "and", end, "are:")

for num in range(start, end + 1):
    # all prime numbers are greater than 1
    # if number is less than or equal to 1, it is not prime
    if num > 1:
        for i in range(2, num):
            # check for factors
            if (num % i) == 0:
                # not a prime number so break inner loop and
                # look for next number
                break
        else:
            print(num)

Exercise Question 12: Display Fibonacci series up to 10 terms

Expected output:

Fibonacci sequence:
0  1  1  2  3  5  8  13  21  34

terms = 10
# first two terms
num1, num2 = 0, 1
count = 0

print("Fibonacci sequence:")
while count < terms:
    print(num1, end="  ")
    temp = num1 + num2
    # update values
    num1 = num2
    num2 = temp
    count += 1

Exercise Question 13: Write a loop to find the factorial of any number

The factorial (symbol: !) means to multiply all whole numbers from our chosen number down to 1.

For example: calculate the factorial of 5

5! = 5 × 4 × 3 × 2 × 1 = 120

Expected output:

120

num = 5
factorial = 1
if num < 0:
    print("Factorial does not exist for negative numbers")
elif num == 0:
    print("The factorial of 0 is 1")
else:
    for i in range(1, num + 1):
        factorial = factorial * i
    print("The factorial of", num, "is", factorial)

Exercise Question 14: Reverse a given integer number

Given:

76542

Expected output:

24567

num = 76542
reverse_number = 0
print("Given Number ", num)
while num > 0:
    reminder = num % 10
    reverse_number = (reverse_number * 10) + reminder
    num = num // 10
print("Revered Number ", reverse_number)

Exercise Question 15: Use a loop to display elements from a given list which are present at even positions

Given:

my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]

Expected output:

20 40 60 80 100

my_list = [10, 20, 30, 40, 50, 60, 70, 80, 90, 100]
for i in my_list[1::2]:
    print(i, end=" ")

Exercise Question 16: Display the cube of the number up to a given integer

Given:

input_number = 6

Expected output:

Current Number is : 1  and the cube is 1
Current Number is : 2  and the cube is 8
Current Number is : 3  and the cube is 27
Current Number is : 4  and the cube is 64
Current Number is : 5  and the cube is 125
Current Number is : 6  and the cube is 216

input_number = 6
for i in range(1, input_number + 1):
    print("Current Number is :", i, " and the cube is", (i * i * i))

Exercise Question 17: Find the sum of the series 2 +22 + 222 + 2222 + .. n terms

Given:

number_of_terms = 5

So series will become 2 + 22 + 222 + 2222 + 22222

Expected output:

24690

number_of_terms = 5
start = 2
sum = 0
for i in range(0, number_of_terms):
    print(start, end=" ")
    sum += start
    start = (start * 10) + 2
print("\nSum of above series is:", sum)

Exercise Question 18: Print the following pattern

* 
* * 
* * * 
* * * * 
* * * * * 
* * * * 
* * * 
* * 
*

rows = 5
for i in range(0, rows):
    for j in range(0, i + 1):
        print("*", end=' ')
    print("\r")

for i in range(rows, 0, -1):
    for j in range(0, i - 1):
        print("*", end=' ')
    print("\r")