fnto each element in every list.
fnon each of them to only keep values not contained in the previously created set of the other.
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]
from math import floor symmetric_difference_by([2.1, 1.2], [2.3, 3.4], floor) # [1.2, 3.4]
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