Default arguments with *args and **kwargs

Question

In Python 2.x (I use 2.7), which is the proper way to use default arguments with *args and **kwargs?
I\'ve found a question on

Answer 1

Another way to handle with Python 2.x:

def foo(*args, **kwargs):
    if 'kwarg-name' not in kwargs.keys():
        kwargs['kwarg-name'] = 'kwarg-name-default-value'
    return bar(*args, **kwargs)

This handles passing arbitrary *args to the underlying call unlike @nneonneo's answer.