Python's *args and **kwargs

When the parameters of a Python function are indeterminate, you can use *args and **kwargs to refer to an indefinite number of arguments.

The difference between the two is that *args is a tuple (tuple), and **kwargs is a dict (dictionary). To put it simply, it is *args without Key,**kwargs with key.

First verify that the above conclusions are correct by code:

def Func_args (*args):    print(type (args))def Func_kwargs (* *  Kwargs):    print(type (Kwargs))if__name__'__main __':    Func_args (1, 2, 3)    Func_kwargs (a=1, b=2, c=3)

Running results, you can clearly see that args is a tuple, Kwargs is a dictionary

<class'tuple'><class'dict' >

Then try to use the *args, implement a function, and return the value of the passed parameter X2. Because the number of arguments passed in is variable, the result returned by the function is also variable.

 def  func_a (*args):  return  Tuple (ARG * 2 for  arg in  Span style= "color: #000000;" > args)  if  __name__  = =  '   

In Func_a, a tuple is returned, and the values of the tuple are assigned to variables A and B, respectively, using the function of the Python tuple to automatically unpack the packets.

Operation Result:

2 4 AA bb

Python's *args and **kwargs