Python: Sum of the magnitudes of the elements in the array with product signs

Python Programming Puzzles: Exercise-57 with Solution

Write a Python program to find the sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries.

Input:
[1, 3, -2]
Output:
-6

Input:
[1, -3, 3]
Output:
-7

Input:
[10, 32, 3]
Output:
45

Input:
[-25, -12, -23]
Output:
-60

Pictorial Presentation:

Sample Solution:

Python Code:

def test(nums):
    tot = sum(abs(i) for i in nums)
    if all(nums):
        return tot if sum(i < 0 for i in nums) % 2 == 0 else -tot
    return 0

nums = [1, 3, -2]
print("Original list of numbers:")
print(nums)
print("Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:")
print(test(nums))
nums = [1, -3, 3]
print("\nOriginal list of numbers:")
print(nums)
print("Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:")
print(test(nums))
nums = [10, 32, 3]
print("\nOriginal list of numbers:")
print(nums)
print("Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:")
print(test(nums))
nums = [-25, -12, -23]
print("\nOriginal list of numbers:")
print(nums)
print("Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:")
print(test(nums))

Sample Output:

Original list of numbers:
[1, 3, -2]
Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:
-6

Original list of numbers:
[1, -3, 3]
Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:
-7

Original list of numbers:
[10, 32, 3]
Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:
45

Original list of numbers:
[-25, -12, -23]
Sum of the magnitudes of the elements in the array with a sign that is equal to the product of the signs of the entries:
-60

Flowchart:

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

Python Code Editor :

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

Previous: Find an integer exponent x such that a^x = n.
Next: Biggest even number between two numbers inclusive.