python 删除所有重复项包括该元素

Question

input: [1,1,2,2,3,3,4,5,5,6,6]

output: 4

尝试，设置，形成新列表，但无法弄清楚如何摆脱包括元素本身在内的所有重复项。

Answer 1

my_list = [1, 1, 2, 2, 3, 3, 4, 5, 5, 6, 6]
filtered_list = [value for value in my_list if my_list.count(value) == 1]
print(filtered_list)
[4]

Answer 2

这是一种方法，使用 collections.Counter

>>> from collections import Counter
>>> inp = [1,1,2,2,3,3,4,5,5,6,6]
>>> counted_inp = Counter(inp)
>>> counted_inp
Counter({1: 2, 2: 2, 3: 2, 5: 2, 6: 2, 4: 1})
>>> [inp_item for inp_item, inp_count in counted_inp.items() if inp_count == 1]
[4]

文档： https://docs.python.org/3.7/library/collections.html#collections.Counter

Answer 3

您可以使用filter() ：

inp = [1,1,2,2,3,3,4,5,5,6,6]
res = list(filter(lambda x: inp.count(x) == 1, inp))  # list() isn't necessary for python 2