Finding Target-Sum Pairs in a List

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

Technology Stack : List comprehension, dictionary

Code Type : Find algorithm

Code Difficulty : Intermediate

                
                    
def sum_pairs(numbers, target):
    seen = {}
    for number in numbers:
        diff = target - number
        if diff in seen:
            return [diff, number]
        seen[number] = True
    return None