To flatten a nested list was (Explanation of this Python language feature? [x for x in x for x in x]
Mark H Harris
harrismh777 at gmail.com
Fri Mar 28 23:05:15 CET 2014
On 3/27/14 6:45 PM, Dan Stromberg wrote:
>> x = [[1,2], [3,4], [5,6]]
>> [x for x in x for x in x]
> I'll give this +1 for playfulness, and -2 for lack of clarity.
> I hope no one thinks this sort of thing is good to do in real-life code.
You might try this to flatten a list of lists:
>>> from functools import reduce
>>> L = [[1,2,3],[4,5,6],,[8,9]]
>>> import operator as λ
>>> reduce(λ.add, L)
[1, 2, 3, 4, 5, 6, 7, 8, 9]
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