On Wed, Apr 6, 2011 at 11:59 PM, Antoine Pitrou <solipsis at pitrou.net> wrote: > On Tue, 5 Apr 2011 12:57:13 -0700 > Raymond Hettinger <raymond.hettinger at gmail.com> wrote: >> >> * I would like to see a restriction on the use of >> the concrete C API such that it is *only* used >> when a exact type match has been found or created >> (i.e. if someone writes Py_ListNew(), then it >> is okay to use Py_ListSetItem()). > > That should be qualified. > For example, not being able to use PyUnicode_AS_STRING in some > performance-critical code (such as the io lib) would be a large > impediment. Str/unicode/bytes are really an exception to most rules when it comes to duck-typing. There's so much code out there that only works with "real" strings, nobody is surprised when an API doesn't accept string look-alikes. (There aren't any standard ABCs for those interfaces, and I haven't really encountered anyone clamouring for them, either). Cheers, Nick. -- Nick Coghlan | ncoghlan at gmail.com | Brisbane, Australia
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