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Python: Determine which triples sum to zero

Python Programming Puzzles: Exercise-39 with Solution

Write a Python program to determine which triples sum to zero from a given list of lists.

Input: 
[[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]] 
Output:
[False, True, True, False, True]

Input:  
[[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
Output:
[True, True, False, False, False]

Pictorial Presentation:

Python: Determine which triples sum to zero.

Sample Solution-1:

Python Code:

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

def test(nums):
    return [sum(t)==0 for t in nums]
 
nums = [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]]
print("Original list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))
nums = [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
print("\nOriginal list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))  

Sample Output:

Original list of lists: [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]]
Determine which triples sum to zero:
[False, True, True, False, True]

Original list of lists: [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
Determine which triples sum to zero:
[True, True, False, False, False]

Flowchart:

Flowchart: Python - Determine which triples sum to zero.

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:

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

def test(nums):
    zero_sums = []
    for trip in nums:
        for i in range(len(trip)):
            for j in range(i + 1, len(trip)):
                for k in range(j + 1, len(trip)):
                    if trip[i] + trip[j] + trip[k] == 0:
                        zero_sums.append(True)
                        break
                else:
                    continue
                break
            else:
                continue
            break
        else:
            zero_sums.append(False)
    return zero_sums
 
nums = [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]]
print("Original list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums))
nums = [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
print("\nOriginal list of lists:",nums)
print("Determine which triples sum to zero:")
print(test(nums)) 

Sample Output:

Original list of lists: [[1343532, -2920635, 332], [-27, 18, 9], [4, 0, -4], [2, 2, 2], [-20, 16, 4]]
Determine which triples sum to zero:
[False, True, True, False, True]

Original list of lists: [[1, 2, -3], [-4, 0, 4], [0, 1, -5], [1, 1, 1], [-2, 4, -1]]
Determine which triples sum to zero:
[True, True, False, False, False]

Flowchart:

Flowchart: Python - Determine which triples sum to zero.

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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Python: Tips of the Day

Decapitalizes the first letter of a string:

Example:

def tips_decapitalize(s, upper_rest=False):
  return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:])
print(tips_decapitalize('PythonTips'))
print(tips_decapitalize('PythonTips', True)) 

Output:

pythonTips
pYTHONTIPS