您如何将列表分成原始中所有重复项的子列表？

Question

l = [a, a, a, b, b, c]

desired1 = [a, a, a]

desired2 = [b, b]

desired3 = [c]

期望也可以是上面所有列表的列表.

Answer 1

您可以使用itertools.groupby()将常见元素组合在一起:

>>> from itertools import groupby
>>> l = ['a', 'a', 'a', 'b', 'b', 'c']
>>> 
>>> runs = [list(group) for _, group in groupby(l)]
>>> runs
[['a', 'a', 'a'], ['b', 'b'], ['c']]
>>> 

请注意,这仅在列表已排序时才有效,因此您可能必须在分组前进行排序:

>>> l = ['a', 'b', 'a', 'b', 'a', 'c'] # unsorted
>>> runs = [list(group) for _, group in groupby(sorted(l))]
>>> runs
[['a', 'a', 'a'], ['b', 'b'], ['c']]
>>>