[Tutor] the "**" operator?

[Hugo Arts]

On Sat, Dec 11, 2010 at 1:26 AM, Alex Hall <mehgcap at gmail.com> wrote:
> Thanks all! I thought update() would add an item even if it would be a
> duplicate, but apparently not. I also now better understand why I am
> always passing around *args and **kwargs when calling super(). Very
> interesting...
>

Actually, it does. If a key is already present, the value will be
overwritten (since you can't have a key with more than one value,
obviously).

If you don't want to overwrite the duplicates, filter them

some_dict.update(x for x in additional_dict.items() if x[0] not in some_dict)