Inada Naoki <songofaca...@gmail.com> added the comment:
> The unpacking is only a problem if you insist on using PyDict_Merge(). It
> would be perfectly possible to implement dict merging from a tuple+vector
> instead of from a dict. In that case, there shouldn't be a performance
> penalty.
Really?
```
class K:
def __eq__(self, other):
return True
def __hash__(self):
time.sleep(10)
return 42
d1 = {"foo": 1, "bar": 2, "baz": 3, K(): 4}
d2 = dict(**d1)
```
I think `dict(**d1)` doesn't call K.__hash__() in this example, because hash
value is cached in d1.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue29312>
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