04.10.18 11:56, Steven D'Aprano пише:
> While keyword arguments have to be identifiers, using **kwargs allows
> arbitrary strings which aren't identifiers:
>
> py> def spam(**kwargs):
> ....     print(kwargs)
> ....
> py> spam(**{"something arbitrary": 1, '\n': 2})
> {'something arbitrary': 1, '\n': 2}
>
>
> There is some discussion on Python-Ideas on whether or not that
> behaviour ought to be considered a language feature, an accident of
> implementation, or a bug.
>
> Can we get some guidence on this please?

This is an implementation detail. Currently CPython doesn't ensure that
keyword argument names are identifiers for performance reasons. But this
can be changed in future versions or in other implementations.

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