Filter non-unique list values

Creates a list with the non-unique values filtered out.

• Use collections.Counter to get the count of each value in the list.
• Use a list comprehension to create a list containing only the unique values.

from collections import Counter

def filter_non_unique(lst):
  return [item for item, count in Counter(lst).items() if count == 1]

filter_non_unique([1, 2, 2, 3, 4, 4, 5]) # [1, 3, 5]