cb8bbd9745
Update formatting in every_nth Update formatting in shuffle Update formatting in has_duplicates Update formatting in group_by Update formatting in sum_by Update formatting in zip Update formatting in longest_item Update formatting in bifurcate_by Update formatting in difference_by Update formatting in clamp_number Update formatting in min_by Update formatting in max_by Update formatting in union Update formatting in n_times_string Update formatting in check_prop Update formatting in chunk Update formatting in transpose Update formatting in bifurcate Update formatting in union_by Update formatting in initialize_list_with_range Update formatting in most_frequent
539 B
539 B
title, tags
| title | tags |
|---|---|
| group_by | list,object,beginner |
Groups the elements of a list based on the given function.
Use map() and fn to map the values of the list to the keys of an object.
Use list comprehension to map each element to the appropriate key.
def group_by(lst, fn):
return {key : [el for el in lst if fn(el) == key] for key in map(fn, lst)}
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']}