[Python] difference_by

[ropering]

차이를 비교하는 함수

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}]