[Python-Dev] Updated PEP 362 (Function Signature Object) (original) (raw)
Nick Coghlan ncoghlan at gmail.com
Thu Jun 7 15:42:57 CEST 2012
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On Thu, Jun 7, 2012 at 11:28 PM, Michael Foord <fuzzyman at voidspace.org.uk> wrote:
We'll probably extend it to copy signature too; then 'signature(decor(f))' will be the same as 'signature(f)'. I don't think functools.wraps can copy the signature by default - it's not uncommon to have decorators that modify signatures. A new parameter to functools.wraps defaulting to False?
Most wrapped functions already report the wrong signature under introspection anyway (typically (*args, **kwds)). Following the wrapped chains by default will produce an answer that is more likely to be correct in such cases.
The big win from my point of view is that thanks to signature, decorators that modify the signature will now have the opportunity to retrieve the signature from the underlying function and accurately report a different signature.
Cheers, Nick.
-- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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