Requiring arguments to be passed as keyword arguments

[Greg Ewing]

Michael Haggerty wrote:
> 
> Hi,
> 
> Sometimes I would like to write functions with arguments that are
> REQUIRED to be passed as keyword arguments

Let's approach this in a more general way. First,
introduce dictionary unpacking:

   (foo, bar, baz) = dict

is equivalent to

   foo = dict['foo']; bar = dict['bar']; baz = dict['baz']

Then we can write

   def wack(a, b, **d):
      (x, y, z) = d

Next, if we allow dictionary unpacking in the parameter
list, we get:

   def wack(a, b, **(x, y, z)):
      ...

Greg