Eric Snow <ericsnowcurren...@gmail.com> added the comment:
> History with dictproxy means I'm also OK with "new type by stealth".
> Perhaps add some tests to check "type(sys.implementation)()" does
> something sane?
Test added. Here's what happens:
>>> cls = type(sys.implementation)
>>> cls()
namespace()
>>> cls(x=1, y=2)
namespace(x=1, y=2)
Though it's not immediately a problem, "vars(cls(x=1, y=2))" returns "{}",
while "ns=cls(x=1, y=2); vars(ns)" returns "{'x': 1, 'y': 2}"!
Certainly it's a corner case, but it could indicate a more sinister problem.
Regardless, I'll track down the root cause and fix it. As far as I can tell,
this odd behavior does not impact sys.implementation.
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<http://bugs.python.org/issue14673>
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