#每日一读 根据给定的函数对列表的元素进行分组

from collections import defaultdict

def group_by(lst, fn):
  d = defaultdict(list)
  for el in lst:
    d[fn(el)].append(el)
  return dict(d)
from math import floor

group_by([6.1, 4.2, 6.3], floor) # {4: [4.2], 6: [6.1, 6.3]}
group_by(['one', 'two', 'three'], len) # {3: ['one', 'two'], 5: ['three']}

标签：el,group,three,6.3,lst,给定,分组,6.1,一读
来源： https://www.cnblogs.com/ai594ai/p/15654320.html