Python Exercises: Sum of the digits in each number in a list is equal

Last update on April 17 2025 13:00:42 (UTC/GMT +8 hours)

Sum of Digits Equality

A Python list contains three positive integers. Write a Python program to check whether the sum of the digits in each number is equal or not. Return true otherwise false.

Sample Data:

([13, 4, 22]) -> True
([-13, 4, 22]) -> False
([45, 63, 90]) -> True

Sample Solution-1:

Python Code:

# Function to check if the sum of digits in each number of the list is equal.
def test(nums):
    # Check if the sum of digits in each number of the list is equal.
    return nums[0] % 9 == nums[1] % 9 == nums[2] % 9

# Example usage of the function with different lists of numbers.
nums = [13, 4, 22]
print("Original list of numbers:", nums)
print("Check sum of the digits in each number of the said list is equal or not!")
print(test(nums))

nums = [-13, 4, 22]
print("\nOriginal list of numbers:", nums)
print("Check sum of the digits in each number of the said list is equal or not!")
print(test(nums))

nums = [45, 63, 90]
print("\nOriginal list of numbers:", nums)
print("Check sum of the digits in each number of the said list is equal or not!")
print(test(nums))

Sample Output:

Original list of numbers: [13, 4, 22]
Check sum of the digits in each number of the said list is equal or not!
True
Original list of numbers: [-13, 4, 22]
Check sum of the digits in each number of the said list is equal or not!
False
Original list of numbers: [45, 63, 90]
Check sum of the digits in each number of the said list is equal or not!
True

Explanation:

Here is a breakdown of the above Python code:

Function definition:

def test(nums):: Defines a function named "test()" that takes a list of three numbers (nums) as input.

Conditional check:

return nums[0] % 9 nums[1] % 9 nums[2] % 9: Checks if the sum of the digits in each number of the list is equal.

Flowchart:

Sample Solution-2:

Python Code:

# Function to check if the sum of digits in each number of the list is equal.
def test(nums):
    # Check if any number in the list is negative.
    if nums[0] < 0 or nums[1] < 0 or nums[2] < 0:
        return False

    # Lambda function to calculate the sum of digits in a number.
    r = lambda x: sum(int(i) for i in str(x))

    # Unpack the list into three variables x, y, and z.
    x, y, z = nums

    # Check if the sum of digits is equal for all numbers in the list.
    return r(x) == r(y) == r(z)

# Example usage of the function with different lists of numbers.
nums = [13, 4, 22]
print("Original list of numbers:", nums)
print("Check sum of the digits in each number of the said list is equal or not!")
print(test(nums))

nums = [-13, 4, 22]
print("\nOriginal list of numbers:", nums)
print("Check sum of the digits in each number of the said list is equal or not!")
print(test(nums))

nums = [45, 63, 90]
print("\nOriginal list of numbers:", nums)
print("Check sum of the digits in each number of the said list is equal or not!")
print(test(nums))

Sample Output:

Original list of numbers: [13, 4, 22]
Check sum of the digits in each number of the said list is equal or not!
True
Original list of numbers: [-13, 4, 22]
Check sum of the digits in each number of the said list is equal or not!
False
Original list of numbers: [45, 63, 90]
Check sum of the digits in each number of the said list is equal or not!
True

Explanation:

Here is a breakdown of the above Python code:

Function definition:

def test(nums):: Defines a function named test that takes a list of three numbers (nums) as input.

Conditional check:

if nums[0] < 0 or nums[1] < 0 or nums[2] < 0:: Checks if any number in the list is negative.
return False: Returns False if any number is negative.

Lambda Function:

r = lambda x: sum(int(i) for i in str(x)): Defines a lambda function (r) to calculate the sum of digits in a number.

Unpacking and Comparison:

x, y, z = nums: Unpacks the list into three variables (x, y, and z).
return r(x) r(y) r(z): Checks if the sum of digits is equal for all numbers in the list.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to check if the sum of digits of each number in a three-element list are all equal.
Write a Python program to compute the digit sum for each number in a list and verify that all sums are identical.
Write a Python program to compare the sum of digits of three numbers and return True if they are all equal.
Write a Python program to iterate over a list of three numbers, sum their digits, and check if the sums match.

Go to:

Previous: Check square root and cube root of a number
Next: Check the numbers that are higher than the previous.

Python Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.