Berteun Damman <[EMAIL PROTECTED]> wrote:
> On Tue, 29 Jan 2008 09:23:16 -0800 (PST), [EMAIL PROTECTED]
><[EMAIL PROTECTED]> wrote:
>> If you're going to delete elements from
>> a list while iterating over it, then do
>> it in reverse order:
>
> Why so hard? Reversing it that way creates a copy, so you might as
> well do:
>>>> a = [ 98, 99, 100 ]
>>>> for i, x in enumerate(a[:]):
> ... if x == 99: del(a[i])
> ... print x
Why so hard?
>>> a = [ 98, 99, 100, 98, 99, 100 ]
>>> for i, x in enumerate(a[:]):
if x == 99: del(a[i])
>>> a
[98, 100, 98, 99]
oops! But:
>>> a = [ 98, 99, 100, 98, 99, 100 ]
>>> last_idx = len(a) - 1
>>> for i, x in enumerate(a[::-1]):
if x == 99: del(a[last_idx - i])
>>> a
[98, 100, 98, 100]
Reversing it works. Your code doesn't.
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