On 15/11/2012 4:21pm, Terry Reedy wrote:
I was thinking that CPython could check the ref count of the input
keyword dict to determine whether it is newly created and can be
returned or is pre-existing and must be copied. But it seems not so.
>>> def d(**x): return sys.getrefcount(x)
>>> import sys
>>> d(a = 3)
2
>>> d(**{'a': 3})
2
>>> b = {'a': 3}
>>> d(**b)
2
I was expecting 3 for the last one.
Isn't it always newly created?
>>> def f(**x): return x
...
>>> b = {'a':3}
>>> b is f(**b)
False
--
Richard
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