如何打印所有连续负值的总和

Question

我想打印列表中所有连续负值的总和

示例

lst = [1,-1,-3,2,3,4,-5,-1,-3,5,-3,-1,5,4]

我想打印 :

的总和

(-1, -3) ;(-5,-1,-3); (-3,-1)

Answer 1

在列表理解中使用 itertools.groupby：

lst = [1,-1,-3,2,3,4,-5,-1,-3,5,-3,-1,5,4]

from itertools import groupby
out = [sum(g) for k,g in groupby(lst, lambda x: x<0) if k]

输出：[-4, -9, -4]

Answer 2

def sum_consecutive(values):
    accumulator = 0
    for value in values:
        if value >= 0:
            if accumulator != 0:
                print(accumulator)
            accumulator = 0
        else:
            accumulator += value

应该可以