[Python-Dev] performance of {} versus dict()

[MRAB]

On 2012-11-14 20:53, Mark Adam wrote:
> On Wed, Nov 14, 2012 at 1:37 PM, Xavier Morel <catch-all at masklinn.net> wrote:
>> On 2012-11-14, at 19:54 , Mark Adam wrote:
>>>
>>> Merging of two dicts is done with dict.update.
>>
>> No, dict.update merges one dict (or two) into a third one.
>
> No.  I think you need to read the docs.
>
>>> How do you do it on
>>> initialization?  This doesn't make sense.
>>
>> dict(d1, **d2)
>
> That's not valid syntax is it?
>
No.

You can have dict(d1) and dict(**d2), but not dict(d1, **d2).