i would use
return IFoo(context, False) is not False or False
On 01.05.2006, at 00:22, Martin Aspeli wrote:
Hi,
I'm probably doing something very wrong, but ...
I have a general interface that can either by directly provided by
an object or class (typically with implements() on the class), but
could also be provided via an adapter. I have a few places where I
just need to check for this (it's not really a marker interface,
but I need to know whether other code later on would be able to use
the interface or not).
In my tests, I tried to use queryAdapter(), but that didn't return
anything when the interface was implemented directly by the class.
Similarly, Interface.providedBy() returns (expectedly) False if the
interface could only be obtained via an adapter. Currently I do:
try:
adapted = IFoo(context)
return True
except (ComponentLookupError, TypeError):
return False
but that's just silly... Is there a pattern for this?
Martin
--
"You can just adapt yourself out of it..." // Archipelago sprint
26/04/2006
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