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
667 B
667 B
title, tags
| title | tags |
|---|---|
| union_by | list,function,intermediate |
Returns every element that exists in any of the two lists once, after applying the provided function to each element of both.
Create a set by applying fn to each element in a, then use list comprehension in combination with fn on b to only keep values not contained in the previously created set, _a.
Finally, create a set from the previous result and a and transform it into a list
def union_by(a, b, fn):
_a = set(map(fn, a))
return list(set(a + [item for item in b if fn(item) not in _a]))
from math import floor
union_by([2.1], [1.2, 2.3], floor) # [2.1, 1.2]