In [42]: lis=[1,2,3,4,5,6,7,8,9,10,11,12]
In [43]: w=3 #window size
In [44]: [sum(lis[i-(w-1):i+1]) if i>(w-1) else sum(lis[:i+1]) for i in range(len(lis))]
Out[44]: [1, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33]
In [45]: w=4
In [46]: [sum(lis[i-(w-1):i+1]) if i>(w-1) else sum(lis[:i+1]) for i in range(len(lis))]
Out[46]: [1, 3, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42]
对于python 2.4或更低版本，请更改三元运算符：
(falseValue, trueValue)[condition] 代替 trueValue if condition else falseValue
[(sum(lis[:i+1]),sum(lis[i-(w-1):i+1]))[i>(w-1)] for i in range(len(lis))]
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