Finding a Pair with Sum as First Element in List

This function takes a list of integers as input and returns a pair of numbers if the sum of the pair is the first number in the list. If such a pair does not exist, it returns None.

Technology Stack : Dictionary (dict)

Code Type : Find function

Code Difficulty : Intermediate

                
                    
def a_sum_pairs(numbers):
    sum_dict = {}
    for number in numbers:
        if number in sum_dict:
            return [sum_dict[number], number]
        else:
            sum_dict[number] = number
    return None