Delete all items in the list

[Gabriel Genellina]

En Thu, 26 Feb 2009 11:00:30 -0200, Boris Borcic <bborcic at gmail.com>  
escribió:

> Chris Rebert wrote:
>> On Thu, Feb 26, 2009 at 3:05 AM, Clarendon <jineu21 at hotmail.com> wrote:
> ...
>>> L=['a', 'b', 'c', 'a']
>>>
>>> I want to delete all 'a's from the list.
>>> But if L.remove('a') only deletes the first 'a'.
>>>
>>> How do you delete all 'a's?
>>  There are several ways. I'd go with a list comprehension:
>
> and for a couple other ways
>
> while 'a' in L : L.remove('a')

This is probably the worst way, takes cuadratic time (and two searches per  
loop).

> L = filter('a'.__ne__,L)

And this is probably the fastest. But not all types define __ne__ so a  
more generic answer would be:

 from functools import partial
 from operator import ne
L = filter(partial(ne, 'a'), L)

Of course, this is only relevant if L is large and there are many  
duplicates. In other cases I'd stick with the list comprehension as posted  
by Chris Rebert.

-- 
Gabriel Genellina