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

Yury Selivanov yselivanov.ml at gmail.com
Thu Jun 14 18:39:42 CEST 2012

On 2012-06-14, at 12:32 PM, Benjamin Peterson wrote:

2012/6/14 Yury Selivanov <yselivanov.ml at gmail.com>:

On 2012-06-14, at 11:24 AM, Brett Cannon wrote:

On Thu, Jun 14, 2012 at 9:50 AM, Yury Selivanov <yselivanov.ml at gmail.com> wrote:

[SNIP] Let's consider replacement of 'Parameter.is*' set of attributes with a single 'Parameter.kind' attribute, which will have the following possible values: 'positional', 'vararg', 'keyword-only', 'varkwarg'. (I think 'positional' is more intuitive than 'index'?)

+1 if this change is made. How about adding 'kind' and keeping 'is*' attributes, but making them read-only dynamic properties, i.e.: class Parameter: ... @property def isvararg(self): return self.kind == 'vararg' ... ? Seems a bit bloatly to me. (One way to do it.)

Yes, but on the other hand it solves "strings are error prone" argument, keeps all 'is_*' attributes in sync, and makes them read-only.

'kind' property may do validation on set, to diminish mistakes probability even further.

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