list: from 2 to 3 dimensions..looking for a nice way
Peter Otten
__peter__ at web.de
Sat Nov 29 17:49:03 EST 2003
Peter Otten wrote:
> Peter Otten wrote:
>
>> sven wrote:
>>
>>> I've got a nested list->
>>> a = [[1,'house'],[2,'house'],[3,'garden']]
>>>
>>>
>>> and I want to get one level deeper with the lists having the same value
>>> in index value 1
>>>
>>> b =[[[1, 'house'], [2, 'house']], [[3, 'garten']]]
[...]
> Or rather
>
> a = [[1,'house'],[2,'house'],[3,'garden']]
>
> d = {}
> for ns in a:
> d.setdefault(ns[1], []).append(n)
> b = d.items()
So many errors in so few lines :-(
Hope I get it right this time:
a = [[1,'house'],[2,'house'],[3,'garden']]
d = {}
for ns in a:
d.setdefault(ns[1], []).append(ns)
b = d.values()
Peter
More information about the Python-list
mailing list