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From: Boris Borcic <bborcic@gmail.com>
Subject: Re: how to make ["a","b",["c","d"],"e"] into ['a', 'b', 'c', 'd', 'e'] ?
Date: Thu, 10 Apr 2014 16:14:55 +0200
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Xref: csiph.com comp.lang.python:70039

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 b=
ut none of its sublists.

 >>> def flatten(L) :
=2E...    for k,_ in enumerate(L) :
=2E...        while isinstance(L[k],list) :
=2E...            L[k:k+1]=3DL[k]

flattens L to any depth, eg

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


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