List difference

Python, List · Nov 2, 2020

Calculates the difference between two iterables, without filtering duplicate values.

  • Create a set from b.
  • Use a list comprehension on a to only keep values not contained in the previously created set, _b.
def difference(a, b):
  _b = set(b)
  return [item for item in a if item not in _b]
difference([1, 2, 3], [1, 2, 4]) # [3]

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