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difference_by python Code Snippet in 2024

listfunctionintermediate

Last Updated: 11 March 2024

Returns the difference between two lists, after applying the provided function to each list element of both.

  • Create a set, using map() to apply fn to each element in b.
  • Use a list comprehension in combination with fn on a to only keep values not contained in the previously created set, _b.
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 } ]

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