On Fri, Apr 11, 2008 at 12:02 PM, Patryk Zawadzki <[EMAIL PROTECTED]> wrote:
> Why not use the opposite test and check for instances of dict?
Because then you have to pass something that subclasses dict instead
of something that implements the interface of dict. We could go on and
on about this all day.
The usual way to approach something like this would be to check for
some attribute of contexts that aren't part of the standard dictionary
protocol. Since contexts work mostly like dicts, the only real
differences are the push() and pop() methods, which dicts don't
support. Welcome to duck typing.
def render(self, context):
"Display stage -- can be called many times"
if not hasattr(context, 'push'):
context = Context(context)
return self.nodelist.render(context)
Of course, I should note that I actually don't have an opinion on this
subject. I'm merely offering an option to suit both sides of the
equation.
-Gul
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