The *args and **kwargs ist a common idiom to allow arbitrary number of arguments to functions as described in the section more on defining functions in the the python documentation.
The *args will give you all funtion parameters a a list:
In [1]: def foo(*args):
...: for a in args:
...: print a
...:
...:
In [2]: foo(1)
1
In [4]: foo(1,2,3)
1
2
3
The **kwargs will give you all keyword arguments except for those corresponding to a formal parameter as a dictionary.
In [5]: def bar(**kwargs):
...: for a in kwargs:
...: print a, kwargs[a]
...:
...:
In [6]: bar(name="one", age=27)
age 27
name one
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