Oh, I get it now, thanks!
On Fri, Apr 13, 2018 at 2:11 AM, Serhiy Storchaka <storch...@gmail.com>
> 12.04.18 22:42, Andrés Delfino пише:
>> I think the update method can (and personally, should) stay unchanged:
>> spam.update(dict(x, y))
>> seems succinct and elegant enough, with the proposed constructor syntax.
>> Sorry my ignorance, do (Mutable)Mapping ABC say anything about
> Mapping and MutableMapping ABCs don't have constructors, but many
> dict-like objects imitate the dict constructor: accept a single mapping or
> a sequence of pairs as a positional argument, and accept other dict as
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