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
650 B
650 B
title, tags
| title | tags |
|---|---|
| difference_by | list,function,intermediate |
Returns the difference between two lists, after applying the provided function to each list element of both.
Create a set by applying fn to each element in b, then use list comprehension in combination with fn on a to only keep values not contained in the previously created set, _b.
def difference_by(a, b, fn):
_b = set(map(fn, b))
return [item for item in a if fn(item) not in _b]
from math import floor
difference_by([2.1, 1.2], [2.3, 3.4], floor) # [1.2]
difference_by([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], lambda v : v['x']) # [ { x: 2 } ]