累计数字清单总和

Question

我查看了与此类似的其他问题，但没有人似乎回答我的问题。我需要编写一个返回数字列表累积和的函数。我有这个，但它似乎没有正常工作：

numbers = [4,3,6] 

sums = [] 

def cumulativeSum(numbers): 
    for i in range(len(numbers) - 1): 
     sums.append(numbers[i] + numbers[i + 1]) 
    return sums 

print cumulativeSum(numbers)  ##[4, 7, 13] What the answers should come out to be 

Answer 1

这将工作，你从来没有访问和数组，你需要为了增加你先前计算并投入它的值

numbers = [4,3,6] 

sums = [] 

def cumulativeSum(numbers): 
    sums.append(numbers[0]) 
    for i in range(len(numbers) - 1): 
     if i == 0: 
      sums.append(numbers[i] + numbers[i + 1]) 
     else: 
      sums.append(numbers[i + 1] + sums[i]) 
    return sums 

print cumulativeSum(numbers) 

Answer 2

>>> numbers = [4,3,6] 
>>> result = [sum(numbers[:i]) for i in range(1, len(numbers)+1)] 
>>> result 
[4, 7, 13]