Creates a list with the 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 non-unique values.
代码实现
from collections import Counter
def filter_unique(lst):
return [item for item, count in Counter(lst).items() if count > 1]
使用样例
filter_unique([1, 2, 2, 3, 4, 4, 5]) # [2, 4]