Iterating over dict and removing some elements

[superpollo]

Ulrich Eckhardt ha scritto:
> 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 thought (untested):

use a copy of d for the if clause, then pop from the original.

bye