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This article introduces the relevant knowledge of "what is the difference between one asterisk and two asterisks in Python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

It is common to see one or two asterisks preceded by input parameters in Python functions, for example:

Def foo (param1, * param2):

Def bar (param1, * * param2):

Both of these uses are actually used to import any number of parameters into the Python function.

Single star (*): * agrs

Import all parameters as tuples (tuple):

Def foo (param1, * param2):

Print (param1)

Print (param2)

Foo (1, 2, 3, 4, 5)

The output of the above code is:

one

(2, 3, 4, 5)

Double star (* *): * * kwargs

Double asterisks (*) import parameters in the form of dictionaries:

Def bar (param1, * * param2):

Print (param1)

Print (param2)

Bar (1Magic axiom 2m Benzo 3)

The output of the above code is:

one

{'averse: 2,' baked: 3}

In addition, another use of a single asterisk is to extract the parameter list:

Def foo (runoob_1, runoob_2):

Print (runoob_1, runoob_2)

L = [1,2]

Foo (* l)

The output of the above code is:

1 2

Of course, these two uses can appear in the same function at the same time:

Def foo (a, baked 10, * args, * * kwargs):

Print (a)

Print (b)

Print (args)

Print (kwargs)

Foo (1, 2, 3, 4, eBay 5, fumig6, grub 7)

The output of the above code is:

one

two

(3, 4)

{'eyed: 5,' favored: 6, 'gelled: 7}

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