[Python-Dev] PEP 362 Third Revision (original) (raw)

Larry Hastings larry at hastings.org
Fri Jun 15 20:52:16 CEST 2012

On Fri, Jun 15, 2012 at 9:52 AM, Benjamin Peterson<benjamin at python.org> wrote:

2012/6/15 Larry Hastings<larry at hastings.org>:

If I understand you correctly, you seem to be trying to apply "isimplemented" to the problem of predicting which specific inputs to a parameter would be valid. I don't think that problem is tractable--it's way too context-specific. Exactly! It's too context sensitive to belong on a generic signature object. Without isimplemented, all the properties of the signature object should only change if you alter the parameter list. How a parameter is dealt with in the function should not affect the signature of a function.

My opinion is that function introspection allows you to answer questions about that function, and the question "Can I use this parameter at all?" is relevant.

On 06/15/2012 10:21 AM, Alexandre Zani wrote:

I agree. It seems to me isimplemented solves too small a class of the problem it attacks to be worth including in the signature.

I concede that I appear to be in an extremely small minority. (Has a single other person stepped forward in support of is_implemented? I don't recall one.)

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