[Python-3000] Fwd: Conventions for annotation consumers (original) (raw)
Jim Jewett jimjjewett at gmail.com
Sun Aug 20 20:12:29 CEST 2006
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On 8/19/06, Paul Prescod <paul at prescod.net> wrote:
On 8/19/06, Ron Adam <rrr at ronadam.com> wrote:
... don't understand the virtue of bringing decorators into the picture. Yes, they are one consumer of metadata.
They aren't being brought in as sample consumers; they are being suggested as producers of metadata.
The following works to assert the data
def f(a, b): ... f.a=int
We're discussing the alternative of
def f(a:int, b):
which is better for some things -- but much worse for others; if the metadata is any longer than int, it is almost certainly worse. So (I believe) he is suggesting that we just reuse decorator syntax
@sig(a=int) ... def f(a, b):
This keeps the single function declaration line short and sweet, reflecting (modulo "self" and a colon) how it is actually called. It gets the annotations (including type information) up where they should be, but they don't overwhelm the variable names.
Whether to also add signature expressions (to make @sig decorators easier to write) is a separate question; the key point is not to mess with the one-line function summary.
-jJ
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