Python：如何查找其中包含最多元素的列表

Question

使用Python，我想输出列表中包含最多元素的名称。

List1 [1,2,4,5,7,2]
List2 [1,4,5,6]
List3 [2,5,4,6,7,8,5,3,]

Answer 1

您可以将列表组合成一个列表字典，然后如前所述，对（列表的）字典值内的每个元素运行len函数以检查长度，然后使用max，如果长度与值匹配，则返回键。

它还会告诉您列表的长度是否相同：

list1 = [1,2,4,5,7,6,5]
list2 = [1,4,5,6]
list3 = [2,5,4,6,7,8,5,3]

list_dict = {}
list_dict['list1'] = list1
list_dict['list2'] = list2
list_dict['list3'] = list3

lengths = {key: len(x) for key, x in list_dict.items()}
longest = max(lengths.values())

for k, v in lengths.items():
  if v == longest:
    print(f'{k} is the longest list')



>>> list3 is the longest list

Answer 2

您可以使用numpy：

import numpy as np

list1 = [1,2,4,5,7,6,5]
list2 = [1,4,5,6]
list3 = [2,5,4,6,7,8,5,3]

lists=[list1, list2, list3]
listsnames=["list1", "list2", "list3"]

most= listsnames[np.argmax([len(l) for l in lists])]