The difference between *args and **kwargs in Python

(Note: This article is part of the content from the Internet, due to the author's limited, shortcomings, but also hope to comment.) ）

mid-Autumn night, slightly cool, but always can't see the moon.

I think, it must be shy, quietly hide behind the clouds.

Well, that's it, I'm so damn witty.

Text:

Note: The 11.6 variable length parameters of the Python Core programming 2nd edition are described in more detail---chapters.

First, the use of *args method

*args is used to package parameters into a tuple to call the function body

Example one:

def function (*args):    print(args, type (args)) function (1)

The output results are shown in tuples:

Example two:

def function (x, y, *args):    Print(x, y, args) function (1, 2, 3, 4, 5)

Output Result:

Second, the use of **kwargs method

**kwargs Package keyword parameter into dict to function body call

Example one:

def Function (* *Kwargs)    :print(Kwargs, type (Kwargs)) function (a=2)

The output is displayed as a list:

Example two:

def Function (* *Kwargs)    :print(Kwargs) function (a=1, b=2, c=3)

Output Result:

Note: The position of the parameter arg, *args, and **kwargs three parameters must be certain. Must be (Arg,*args,**kwargs) this order, or the program will error.

def function (arg,*args,**kwargs):    print(arg,args,kwargs) function ( 6,7,8,9,a=1, b=2, c=3)

Output Result:

Oops, finished.

Mid-Autumn Festival, think more, want to mention a pot of wine about a few old friends driving a leaf boat,

Lost in the hometown of Jiangnan Water village. The boat swung clear and lakes over the waves.

The difference between *args and **kwargs in Python