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 constructors?

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 kwargs.

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