Because that looks at the values of the array and returns the items
which have a value that is divisible by two, not the position of the
value within the array. It is simpler to comprehend if you don't put
numbers in the list:
>>> l = [ 'pos 0', 'pos 1', 'pos 2', 'pos 3' ]
>>> filter(lambda x: not x%2, l)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 1, in <lambda>
TypeError: not all arguments converted during string formatting
>>> [ val for val, i in itertools.izip(l, itertools.count()) if i % 2 ]
['pos 1', 'pos 3']
What the OP originally asked for was for items in the i'th position in
a list, where i is odd. Your solutions all ignore the position, and
only look at the value.
On Thu, Dec 9, 2010 at 11:27 AM, Cal Leeming [Simplicity Media Ltd]
<cal.leem...@simplicitymedialtd.co.uk> wrote:
> I see no need to get itertools involved ;) Why not just use this:
>
> filter(lambda x: not x%2, a)
>
>
> On 09/12/2010 11:24, Tom Evans wrote:
>>
>> Hmm, those are the values that are odd, he wanted the values from odd
>> indices, eg:
>>
>>>>> a=[2,3,4,5,6,7]
>>>>> filter(lambda x: x%2, a)
>>
>> [3, 5, 7]
>>>>>
>>>>> [ val for val, i in itertools.izip(a, itertools.count()) if not i % 2 ]
>>
>> [2, 4, 6]
>>
>> That could probably be written a bit nicer..
>>
>> On Thu, Dec 9, 2010 at 10:44 AM, Cal Leeming [Simplicity Media Ltd]
>> <cal.leem...@simplicitymedialtd.co.uk> wrote:
>>>>>>
>>>>>> mylist = [1,2,3,4,5,6,7,8]
>>>>>> filter(lambda x: x%2, mylist)
>>>
>>> [1, 3, 5, 7]
>>> This what you need?
>>>
>>> On 09/12/2010 10:34, Phani Chand wrote:
>>>>
>>>> i am passing though a list{1,2,3,4} but i want only the numbers with odd
>>>> index in template written in html --
>>>> You received this message because you are subscribed to the Google
>>>> Groups
>>>> "Django users" group.
>>>> To post to this group, send email to django-us...@googlegroups.com.
>>>> To unsubscribe from this group, send email to
>>>> django-users+unsubscr...@googlegroups.com.
>>>> For more options, visit this group at
>>>> http://groups.google.com/group/django-users?hl=en.
>>>
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "Django users" group.
>>> To post to this group, send email to django-us...@googlegroups.com.
>>> To unsubscribe from this group, send email to
>>> django-users+unsubscr...@googlegroups.com.
>>> For more options, visit this group at
>>> http://groups.google.com/group/django-users?hl=en.
>>>
>>>
>
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To post to this group, send email to django-us...@googlegroups.com.
To unsubscribe from this group, send email to
django-users+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/django-users?hl=en.
