Python：计算一大堆数组的平均值而不保存它们

Question

我有大量的列表，我想计算平均值而不存储所有列表。有没有python实现呢？

由于

Answer 1

如果你想平均整个数组（必须是兼容的形状）：

running_sum = None
count = 0
for a in yourarraysource:
    if running_sum is None:
        running_sum = a
    else:
        running_sum = running_sum + a
    count += 1
average = running_sum / count

如果你想平均所有元素：

running_sum = 0
count = 0
for a in yourarraysource:
    running_sum += a.sum()
    count += a.size
average = running_sum / count