"Calvin Spealman" <[EMAIL PROTECTED]> wrote:
> I am not aware of anything in the stdlib to do this easily, but its
> pretty easy to get them. See this example:
>
> class format_collector(object):
> def __init__(self):
> self.names = []
> def __getitem__(self, name):
> self.names.append(name)
> return ''
>
> collector = format_collector()
> "%(foo)s %(bar)s" % collector
> assert collector.names == ['foo', 'bar']
>
> Of course, wrapping this functionality into a simple function is
> straightforward and will look better.
You should return a value like 0 instead of ''.
>>> collector = format_collector()
>>> "%(foo)s %(bar)d" % collector
Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
"%(foo)s %(bar)d" % collector
TypeError: int argument required
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