Difference between default arguments and keyword arguments

[Aahz]

In article <mailman.330.1081101671.20120.python-list at python.org>,
Paul Prescod  <paul at prescod.net> wrote:
>
>Functions implemented in C do not always have the property that every 
>argument is a keyword argument. Functions implemented in Python do have 
>that property. It's an implementation quirk.

Really?

    def foo(*args):
        pass

    foo(x=1)

Traceback (most recent call last):
  File "x.py", line 4, in ?
    foo(x=1)
TypeError: foo() got an unexpected keyword argument 'x'
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