Learn Python's *args and **kwargs

*args represents any number of nameless parameters, which is a tuple (tuple); **kwargs represents a keyword argument, which is a dict (dictionary)

1 defFoo (*args, * *Kwargs):2     Print 'args =', args3     Print 'Kwargs =', Kwargs4     Print '###'5 if __name__=='__main__':6Foo (1,2,3,4)7Foo (a=1,b=2,c=3)8Foo (1,2,3,4, a=1,b=2,c=3)9Foo'a', 1, None, A=1, b='2', c=3)

As you can see from the running results above, these two are mutable parameters in Python.

Note: When using *args and **kwargs at the same time, you must *args the parameter column in front of the **kwargs, you can try to see the results

There's another usage, creating a dictionary.

1 def kw_dict (* *Kwargs):2     return  kwargs3print kw _dict (a=1,b=2,c=3)

Print it out:

1 {'a''b'c ': 3}

Learn Python's *args and **kwargs