On 02.03.2017 14:08, Serhiy Storchaka wrote: > On 02.03.17 12:04, M.-A. Lemburg wrote: >> This is not new syntax, nor is it a keyword. It's only a >> new singleton and it is well usable outside of function >> declarations as well, e.g. for class attributes which are >> not yet initialized (and which can accept None as value). > > If it is not a keyword, it could be used in expressions, e.g. assigned > to a variable or passed to a function. It could be monkey-patched or > hidden by accident (as True and False in Python 2).
Yes, sure. My proposal was just to address the problems of changing Python syntax and making it possible to define positional only arguments in Python functions/methods in a backwards compatible way. The same could be had by adding a C function proxy to Python which then takes care of the error handling, since we already have the logic for C functions via PyArg_ParseTuple*(). A decorator could then apply the proxy as needed or ignore this for older Python versions without breaking compatibility (or a PyPI extension could provide the same proxy logic for older versions). FWIW: I don't think the use case for positional only arguments to Python functions is strong enough to warrant breaking backwards compatibility by introducing new syntax. -- Marc-Andre Lemburg eGenix.com Professional Python Services directly from the Experts (#1, Mar 02 2017) >>> Python Projects, Coaching and Consulting ... http://www.egenix.com/ >>> Python Database Interfaces ... http://products.egenix.com/ >>> Plone/Zope Database Interfaces ... http://zope.egenix.com/ ________________________________________________________________________ ::: We implement business ideas - efficiently in both time and costs ::: eGenix.com Software, Skills and Services GmbH Pastor-Loeh-Str.48 D-40764 Langenfeld, Germany. CEO Dipl.-Math. Marc-Andre Lemburg Registered at Amtsgericht Duesseldorf: HRB 46611 http://www.egenix.com/company/contact/ http://www.malemburg.com/ _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
