List all contiguous sub-arrays

Question

I have an array [1, 2, 3] of integer and I need to return all the possible combination of contiguous sub-arrays of this array.

[[1],[2],[3],[1,2],

Answer 1

Simplifying the Inspector's solution:

def getAllWindows(L):
    for w in range(1, len(L)+1):
        for i in range(len(L)-w+1):
            yield L[i:i+w]

And a solution using no loops at all:

def allSubArrays(L,L2=None):
    if L2==None:
        L2 = L[:-1]
    if L==[]:
        if L2==[]:
            return []
        return allSubArrays(L2,L2[:-1])
    return [L]+allSubArrays(L[1:],L2)