[Tutor] how to understand unhashable type: 'list'

[Christian Witts]

On 2011/11/17 11:59 AM, lina wrote:
> list1
> [['61', '34', '61', '34'], ['61', '35', '61', '70', '61'], ['61',
> '70', '61', '34'], ['34', '58', '34', '58']]
>>>> weight={}
>>>> weight{list1[0]}=1
> SyntaxError: invalid syntax
>>>> weight[list1[0]]=1
> Traceback (most recent call last):
>    File "<pyshell#292>", line 1, in<module>
>      weight[list1[0]]=1
> TypeError: unhashable type: 'list'
> I wonder how to count the occurence of the list of lists.
>
> Thanks, ^_^
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>
sum(1 if type(elem) == list else 0 for elem in list1) not work for you 
if all you want to do is count how many lists you have in your main list ?
-- 

Christian Witts
Python Developer
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