Returns the symmetric difference between two lists, after applying the provided function to each list element of both.
- Create a
set
by applyingfn
to each element in every list. - Use a list comprehension in combination with
fn
on each of them to only keep values not contained in the previously created set of the other.
代码实现
def symmetric_difference_by(a, b, fn):
(_a, _b) = (set(map(fn, a)), set(map(fn, b)))
return [item for item in a if fn(item) not in _b] + [item
for item in b if fn(item) not in _a]
使用样例
from math import floor
symmetric_difference_by([2.1, 1.2], [2.3, 3.4], floor) # [1.2, 3.4]
翻译自:https://www.30secondsofcode.org/python/s/symmetric-difference-by