[Python-Dev] Decorators: vertical bar syntax
James Y Knight
foom at fuhm.net
Mon Aug 9 18:38:35 CEST 2004
On Aug 8, 2004, at 9:31 PM, Bill Janssen wrote:
> Guido, could you expand on this principle a bit? Just stated as it
> is, it sounds as pointless (to my untutored mind, at least :-), as the
> arguments about "@ is ugly, so it shouldn't be used". After all,
> isn't "what the function does" an important external property of the
> function, and don't you have to peek inside the block to determine
> that? For instance, how do you know whether a function is a generator
> unless you look for yield statements inside it?
A function being a generator only* affects the return value, so not
knowing what functions are generator functions are really just a
special case of not knowing the return value of any function. That can
be solved with documentation, or a decorator.
*: well not really, but to the external caller it's equivalent.
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