What's the difference between one asterisk and two asterisks in Python
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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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