PEP 318 decorators are not Decorators
arien_malec at yahoo.com.REMOVE
Fri Aug 13 04:56:34 CEST 2004
I've been following the decorator debate with some interest, and it's taken
me a reasonably long time to understand what is meant by a decorator. One
of the issues is that the Decorator pattern is more like a Unix pipe than
it is what PEP 318 calls a decorator. The classic decorator is run-time,
rather than define time, and is non-destructive to the base function. The
PEP 318 decorator is define time and is a destructive change to the base
function. For instance, the GoF book makes it clear that decorators may be
added or removed without affecting the underlying class.
I personally think it's confusing to reuse the "Decorator" name for
something that is not a classic decorator. I also agree with the many
comments that the proposed syntax does not make it clear that what is going
on is a destuctive transformation of the defined function.
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