Finding Pair Sum with Set Lookup

This function takes a list of numbers and a target sum as arguments, and returns a list of two numbers from the list that add up to the target sum. If no such pair is found, it returns None.

Technology Stack : list, set

Code Type : Function

Code Difficulty : Intermediate

                
                    
def sum_pairs(numbers, target_sum):
    seen = set()
    for number in numbers:
        difference = target_sum - number
        if difference in seen:
            return [difference, number]
        seen.add(number)
    return None