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]
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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]
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