Python: Find the sum of the even elements that are at odd indices

Python Programming Puzzles: Exercise-63 with Solution

Write a Python program to find the sum of the even elements that are at odd indices in a given list.

Input:
[1, 2, 3, 4, 5, 6, 7]
Output:
12

Input:
[1, 2, 8, 3, 9, 4]
Output:
6

Pictorial Presentation:

Sample Solution-1:

Python Code:

#License: https://bit.ly/3oLErEI

def test(nums):
    return sum(i for i in nums[1::2] if i % 2 == 0) 
nums = [1, 2, 3, 4, 5, 6, 7]
print("Original list of numbers:")
print(nums)
print("Sum of the even elements of the said list that are at odd indices:")
print(test(nums))
nums = [1, 2, 8, 3, 9, 4] 
print("\nOriginal list of numbers:")
print(nums)
print("Sum of the even elements of the said list that are at odd indices:")
print(test(nums)) 

Sample Output:

Original list of numbers:
[1, 2, 3, 4, 5, 6, 7]
Sum of the even elements of the said list that are at odd indices:
12

Original list of numbers:
[1, 2, 8, 3, 9, 4]
Sum of the even elements of the said list that are at odd indices:
6

Flowchart:

Visualize Python code execution:

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

Sample Solution-2:

Python Code:

def test(nums):
    return sum([nums[i] for i in range(len(nums)) if i % 2 == 1 and nums[i] % 2 == 0])
nums = [1, 2, 3, 4, 5, 6, 7]
print("Original list of numbers:")
print(nums)
print("Sum of the even elements of the said list that are at odd indices:")
print(test(nums))
nums = [1, 2, 8, 3, 9, 4] 
print("\nOriginal list of numbers:")
print(nums)
print("Sum of the even elements of the said list that are at odd indices:")
print(test(nums))

Sample Output:

Original list of numbers:
[1, 2, 3, 4, 5, 6, 7]
Sum of the even elements of the said list that are at odd indices:
12

Original list of numbers:
[1, 2, 8, 3, 9, 4]
Sum of the even elements of the said list that are at odd indices:
6

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 :

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