Question

好的，所以我在列表中有一个列表（像疯狂一样开始），它看起来像这样....

list = [[62.0, 0.07427184466019418, 9, 0.6058252427184466, 0.07455501618122977, 0.0634304207119741, 0.12637540453074433, 0.4357200647249191, 0, 0, 45], [98.0, 0.32406580793266165, 16, 1.9099604642265018, 0.5279938783318454, 0.19997449304935594, 3.547506695574544, 1.3736768269353399, 0, 0, 35]]

我要做的是找到每个项目的平均值。所以在上面的列表中我添加62.0 + 98.0（62 + 98是每个列表中的第一项）并除以2来找到平均值。

我在想这样的事情......

for row in list:

        counter = + 1
        row[0] = row[0] + row[0] / under_total

非常欢迎任何建议。我希望这是有道理的，谢谢你的期待。

Answer 1

L = [[62.0, 0.07427184466019418, 9, 0.6058252427184466, 0.07455501618122977, 0.0634304207119741, 0.12637540453074433, 0.4357200647249191, 0, 0, 45], [98.0, 0.32406580793266165, 16, 1.9099604642265018, 0.5279938783318454, 0.19997449304935594, 3.547506695574544, 1.3736768269353399, 0, 0, 35]]

answer = []
for col in zip(*L):
    answer.append(sum(col)/len(col))
print(answer)

输出：

[80.0, 0.1991688262964279, 12.5, 1.2578928534724743, 0.30127444725653757, 0.131702456880665, 1.8369410500526442, 0.9046984458301295, 0.0, 0.0, 40.0]

如果列表中包含非数字条目：

answer = []
for col in zip(*L):
    col = [c for c in col if isinstance(c, int) or isinstance(c, float)]
    answer.append(sum(col)/len(col))
print(answer)

如果确实可能有一个满了非数字值的列，那么您可能会遇到ZerDivisionError。所以，让我们说在这些情况下，你想说平均值为0。那么这应该可以解决问题：

answer = []
for col in zip(*L):
    col = [c for c in col if isinstance(c, int) or isinstance(c, float)]
    if col:
        answer.append(sum(col)/len(col))
    else:
        answer.append(0)
print(answer)

Answer 2

内置zip功能适合这项工作：

>>> s
[[62.0, 0.07427184466019418, 9, 0.6058252427184466, 0.07455501618122977, 0.0634304207119741, 0.12637540453074433, 0.4357200647249191, 0, 0, 45], [98.0, 0.32406580793266165, 16, 1.9099604642265018, 0.5279938783318454, 0.19997449304935594, 3.547506695574544, 1.3736768269353399, 0, 0, 35]]
>>> [(i + j) / 2 for i, j in zip(s[0], s[1])]
[80.0, 0.1991688262964279, ...]

我们甚至可以将它推广到任意数量的子列表：

>>> [sum(l)/len(l) for l in zip(*s)]
[80.0, 0.1991688262964279, 12, 1.2578928534724743, 0.30127444725653757, 0.131702456880665, 1.8369410500526442, 0.9046984458301295, 0, 0, 40]

在列表中的列表中添加项目以查找平均值

2 个答案: