On 2011/11/17 03:56 PM, lina wrote:
<snip>
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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 ?
not count how many sublists in the main list.
wanna count the occurence of the sublists,
I mean, something like
dictionary[list1[1]]=occurence
Traceback (most recent call last):
File "<pyshell#298>", line 1, in<module>
dictionary[list1[1]]=1
TypeError: unhashable type: 'list'
dictionary[list1[1]]=1
Traceback (most recent call last):
File "<pyshell#298>", line 1, in<module>
dictionary[list1[1]]=1
TypeError: unhashable type: 'list'
For that you'll need to convert your list to a hash-able type if you want to
use dictionaries for your store, easiest would probably to use the string
representation for it so you could do
list1 = [['61', '34', '61', '34'], ['61', '35', '61', '70', '61'],
['61', '70', '61', '34'], ['34', '58', '34', '58']]
weight = {}
for elem in list1:
... if elem.__repr__() in weight:
This is cool.
May I ask which role the __repr__ plays here?
__repr__ is the string representation of a Python object [1] so I'm
using it to create something that is hash-able to be used as the
dictionary key value.
[1] http://docs.python.org/library/functions.html#repr
--
Christian Witts
Python Developer
//
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