twosum.py

def two_sum(number_list,target):
    hash_dict = dict()
    for key,value in enumerate(number_list):
        hash_dict.update({value: key})
    for i, number in enumerate(number_list):
        j = hash_dict.get(target - number)
        if j is not None and j != i:
            return [i,j]


number_list = [11, 2, 7, 15]
target = 9
result = two_sum(number_list, target)
print(result)