[Python-ideas] Attribute Docstrings and Annotations
tony at PageDNA.com
Fri Jun 1 18:19:22 CEST 2007
On May 31, 2007, at 6:15 AM, Ali Sabil wrote:
> Hello all,
> I was looking into function annotations, that are to be introduced
> in Python3k, and I found this old message sent to this mailing
> list : http://mail.python.org/pipermail/python-ideas/2007-January/
> I would like to restart the discussion of attribute annotation,
> because in my opinion it can be a very powerful feature. I
> personally think about using it for SOAP message serialization, or
> any kind of XML serialization, the Idea would be to annotate
> various object attribues to be either marshaled as XML Elements or
> XML Attributes of the current Node that reflects the Object.
I'm afraid the PEP deadline has passed, restarting the discussion would
not change that.
Your use case sounds interesting. I know there are a lot of other use
attribute meta-data. However there are lots of ways to achieve
attribute meta data
# Via naming convention
attr = 1
f_attr = int
# Via decorators
attr = annotated_value(1, int)
# Via a separate class
attr = int
attr = 1
# Compare to attribute annotation syntax
attr: int = 1
Each of the existing idioms I have seen or used has issues, mostly
minor. I suspect that because
the existing ways don't have glaring deficiencies, even if it were
before the PEP deadline, a renewed
push on the proposal would have encountered a lot more resistance.
I still think the syntax is elegant in symmetry and provides a
unified and improved idiom for
a common use case.
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