[Python-Dev] Very Strange Argument Handling Behavior (original) (raw)

Benjamin Peterson benjamin at python.org
Sat Apr 17 19:33:12 CEST 2010

2010/4/17 Guido van Rossum <guido at python.org>:

On Sat, Apr 17, 2010 at 9:22 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:

Guido van Rossum wrote:

Because Python promises that the object the callee sees as 'kwargs' is "just a dict".

Huh, I thought kwargs was allowed to be implemented as a string-keys-only dict (similar to class and module namespaces) while still be a valid Python implementation. I guess I was wrong. Actually I don't know about that. Is there language anywhere in the language reference that says this? What do IronPython, Jython, PyPy actually do?

Similar to CPython, PyPy has dict versions optimized for strings, which fall back to the general version when given non-string keys.

-- Regards, Benjamin

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