Rustom Mody wrote:
def fl1(l): return [y for x in l for y in x]


# recursive flatten
def fr(l):
...   if not isinstance(l,list): return [l]
...   return fl1([fr(x) for x in l])

For a short non-recursive procedure - not a function, modifies L in-place but 
none of its sublists.

>>> def flatten(L) :
....    for k,_ in enumerate(L) :
....        while isinstance(L[k],list) :
....            L[k:k+1]=L[k]

flattens L to any depth, eg

>>> L=[1,[2,[3,4]],5,6,[[7],8]]
>>> flatten(L)
>>> L
[1, 2, 3, 4, 5, 6, 7, 8]


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