How to groupby consecutive values in pandas DataFrame

Question

I have a column in a DataFrame with values:

[1, 1, -1, 1, -1, -1]

How can I group them like this?

[1,1] [-1] [1] [-1, -1]
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Answer 1

Using groupby from itertools data from Jez

from itertools import groupby
[ list(group) for key, group in groupby(df.a.values.tolist())]
Out[361]: [[1, 1], [-1], [1], [-1, -1]]