On 13 Jan 2017, at 09:07, Nathaniel Smith <njs@pobox.com> wrote:

I was imagining something along the lines of

ClientContext({...}).wrap_socket(...)

where ClientContext.__init__ would do the validation. Or there are
various other ways to slot the pieces together, but in general
validation doesn't need to be done incrementally; there's going to be
some place where the config dict hits the library and it can/should be
validated at that point. And before that point we get all the dict
niceties for free.