Iterating over dict and removing some elements

[Rebelo]

On 05/11/2010 05:08 PM, Ulrich Eckhardt wrote:
> Hi!
>
> I wrote a simple loop like this:
>
>    d = {}
>    ...
>    for k in d:
>        if some_condition(d[k]):
>            d.pop(k)
>
> If I run this, Python complains that the dictionary size changed during
> iteration. I understand that the iterator relies on the internal structure
> not changing, but how would I structure this loop otherwise?
>
> My first approach was to simply postpone removing the elements, but I was
> wondering if there was a more elegant solution.
>
> Thanks!
>
> Uli
>


i am wondering why not like this:

 >>> d = {1: 'one', 2: 'two', 3: 'three'}
 >>> for k,v in d.items():
...     if k==1:
...          del d[k]
...
 >>> d
{2: 'two', 3: 'three'}
 >>>