Dynamically pass a function arguments from a dict

[Dan Eloff]

You can take a dictionary of key/value pairs and pass it to a function as  
keyword arguments:

def func(foo,bar):
	print foo, bar

args = {'foo':1, 'bar':2}

func(**args)

will print "1 2"

But what if you try passing those arguments to a function

def func2(bar,zoo=''):
	print bar, zoo

How can you determine that func2 will only accept
bar and zoo, but not foo and call the function with
bar as an argument?

I know CherryPy does this, but it's not obvious from the source
how they pulled it off.

-Dan