[Python-3000] PEP 3133: Introducing Roles

[Collin Winter]

On 5/14/07, Arvind Singh <arvind1.singh at gmail.com> wrote:
> > Asking Questions About Roles
>
> Shouldn't there be some way to ``revoke'' roles?

No, roles are purely additive. Allowing role revocation is an easy
recipe for race conditions where one bit of code says type X does a
given role and another bit of code says it doesn't.

> How can we get a list of all roles played by an object?

Something like this could be trivially added. What use-case do you have in mind?

> Should there be a way to check ``loosely'' whether an object can
> potentially play a given role? (i.e., checking whether an object
> provides a give interface, atleast syntactically)

This could be added, yes.

Collin Winter