[Python-Dev] Keyword-only parameters
Larry Hastings
larry at hastings.org
Tue Apr 14 21:40:32 CEST 2015
On 04/14/2015 01:40 PM, Eric V. Smith wrote:
> I'm working on adding a numeric_owner parameter to some tarfile methods
> (http://bugs.python.org/issue23193),
>
> In a review, Berker suggested making the parameter keyword-only. I agree
> that you'd likely never want to pass just "True", but that
> "numeric_owner=True" would be a better usage.
Boolean parameters are the classic problem that keyword-only parameters
solve. It forces the caller to provide context for the parameter,
solving the mystery-meat API problem of
tarfile.extractall(".", None, True)
On 04/14/2015 01:56 PM, Paul Sokolovsky wrote:
> But newer parts of stdlib, e.g. asyncio, visibly overuse kw-only args.
Overuse? asyncio? You mean "that thing Guido just wrote last year"?
The most practical definition I've heard for the word "pythonic" is
"code like Guido writes".
//arry/
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