pandas 系列中所有元素中最大的元素 [英] largest element all lists in Panda Series

问题描述

我有个熊猫系列说

import pandas as pd
a = pd.Series([
    [1, 2, 3, 4, 5],
    [6, 7, 8, 3, 334],
    [333, 4, 5, 3, 4]
])

我想在所有列表中找到最大的元素，即334，最简单的方法是什么?

I want to find the largest element in all lists, which is 334, what is the easy way to do it?

推荐答案

选项1
仅当元素实际上是list时才起作用.这是因为sum连接列表.这也可能很慢.

Option 1
Only works if elements are actually list. This is because sum concatenates lists. This is also likely very slow.

max(a.sum())

334

---

选项2
max

---

Option 2
minimal two tiered application of max

max(map(max, a))

334

---

选项3
仅当所有列表的长度相同

---

Option 3
Only works if all lists are same length

np.max(a.tolist())

334

---

选项4
max在退绕发电机上的一种应用

---

Option 4
One application of max on an unwound generator

max(x for l in a for x in l)

334

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