Python具有此 groupby :

Python has this groupby in the libraries for you:

>>> list1 = [1,1,1,1,1,1,2,3,4,4,5,1,2]
>>> from itertools import groupby
>>> [k for k,_ in groupby(list1)]
[1, 2, 3, 4, 5, 1, 2]

您可以使用keyfunc参数对其进行调整，以同时处理第二个列表.

You can tweak it using the keyfunc argument, to also process the second list at the same time.

>>> list1 = [1,1,1,1,1,1,2,3,4,4,5,1,2]
>>> list2 = [9,9,9,8,8,8,7,7,7,6,6,6,5]
>>> from operator import itemgetter
>>> keyfunc = itemgetter(0)
>>> [next(g) for k,g in groupby(zip(list1, list2), keyfunc)]
[(1, 9), (2, 7), (3, 7), (4, 7), (5, 6), (1, 6), (2, 5)]

如果您想再次将这些对拆分成单独的序列:

If you want to split those pairs back into separate sequences again:

>>> zip(*_)  # "unzip" them
[(1, 2, 3, 4, 5, 1, 2), (9, 7, 7, 7, 6, 6, 5)]