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

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

## Python Basic - 1: Exercise-147 with Solution

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:

Python Code Editor:

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