subsequences of an array that are not zero [closed]

Answer 1

In [117]: l = [240,200,160,4,0,0,0,0,4,4,4,0,0,0,1,1,1,1]

In [118]: [list(vals) for mask,vals in itertools.groupby(l, key=lambda n:n!=0) if mask]
Out[118]: [[240, 200, 160, 4], [4, 4, 4], [1, 1, 1, 1]]

Answer 2

Contiguous subsequences? Paging Dr. Groupby, Dr. itertools.groupby:

>>> from itertools import groupby
>>> l = [240,200,160,4,0,0,0,0,4,4,4,0,0,0,1,1,1,1]
>>> [list(g) for k,g in groupby(l, lambda x: x != 0) if k]
[[240, 200, 160, 4], [4, 4, 4], [1, 1, 1, 1]]

or even if we take advantage of the fact bool(0) is False and bool(any other integer) is True:

>>> [list(g) for k,g in groupby(l, bool) if k]
[[240, 200, 160, 4], [4, 4, 4], [1, 1, 1, 1]]