Interpolation (was: Keyword calling gotcha ?)

[Gordon McMillan]

Darrell writes:

> Let me show my ignorance a bit.
>  def a(**x):
> ...     print x
> 
> >>> def b(**x):
> ...     a(x)
> 
> When 'b' calls 'a' it is passing a dictionary while 'a' wants a
> keyword thing that it resolves to a dictionary. Wouldn't be nice if
> the keyword thing could mark the dictionaries it creates. Then just
> pass them though when it sees one if the only other choice was an
> error.

>>> def a(d=None, **kwargs):
...  print `d or kwargs`

>>> def b(**kwargs):
...  a(kwargs)

>>> b(foo=1, bar=3.3)
{'foo': 1, 'bar': 3.3}

- Gordon