bare "*" asterisk in function parameter lists to force the caller to use keyword arguments for certain parameter

In Python 3 you can use a bare "*" asterisk in function parameter lists to force the caller to use keyword arguments for certain parameter

Solution

>>> def f(a, b, *, c='x', d='y', e='z'):
...     return 'Hello' 
>>> f(1, 2, 'p', 'q', 'v')
TypeError: 
"f() takes 2 positional arguments but 5 were given"
>>> f(1, 2, c='p', d='q',e='v')
'Hello'

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