[Python-3000] Conventions for annotation consumers (was: Re: Draft pre-PEP: function annotations) (original) (raw)

Collin Winter collinw at gmail.com
Tue Aug 15 00:51:40 CEST 2006

On 8/14/06, Jim Jewett <jimjjewett at gmail.com> wrote:

On 8/14/06, Collin Winter <collinw at gmail.com> wrote: > The problem with using lists is that its impossible for non-decorator > annotation consumers to know which element "belongs" to them.

The ones whose type they own -- which is why I see at least some parallel to exceptions, and its inheritance based semantics. def f(a:[mytype("asdfljasdf"), zope.mypackage.something(b,d,e), "a string", mytype([47]), 15): Whoever defined mytype controls the meaning of the mytype annotations; anyone not familiar with that package should ignore them (and hope there were no side effects in the expressions that generated them). zope.mypackage controls that annotation; anyone not familiar with that product should ignore it (and hope there were no side effects ...)

As hideous as I think this is from an aesthetics/visual noise standpoint, it's probably the only reliable way to let both decorator- and non-decorator-based consumers work.

What would the rule be about top-level types? Would you have to use a list, or could a set or dict be used?

Collin Winter

More information about the Python-3000 mailing list