sum7.py

sum7.py

def sum7(list):
    if len(list) < 1:
        return -1
    else:
        count = 0
        for x in list:
            if x == 7:
                try:
                    list[count + 1] *= 2
                    count += 1
                except:
                    count += 1
            else:
                count += 1
        return sum(list)

# 実行例
print(sum7([1, 2]))
print(sum7([3, 7]))
print(sum7([7, 5, 6]))
print(sum7([7, 9, 7, 9, 7, 9]))
print(sum7([]))