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Description

1. The number of parameters that need to be handled by a function is uncertain, so you can use multi-valued parameters.

2. Python has two multi-valued parameters. Add a * before the parameter name to receive tuples. Add two * before the parameter name to receive the dictionary.

Instance def demo (num, * args, * * kwargs): print (num) print (args) print (kwargs) demo (1,2,3,4,5, name= "Xiaoming", age=18, gender=True)

Expansion of knowledge points:

Multi-valued parameter

Defining a function that supports multi-fingered parameters may sometimes require that the number of parameters that a function can handle is uncertain, so you can use multi-valued parameters.

There are two kinds of multi-valued parameters in python: one to receive tuples before the parameter name, two to receive dictionaries before the parameter name, and generally when naming multi-valued parameters. It is customary to use the following two names:

Args: stores tuple parameters; there is one in front of it; * kwargs stores dictionary parameters, and there are two in front of them

Args is the abbreviation of variable arguments and has the meaning of variable. Kw is required by keywad, and kwargs can memorize key-value pairs of parameters.

Def demo (num,*args,**kwargs): print (num) print (args) print (kwargs) demo (1, 2, 3, 4, 5, name = "Xiaoming", gender = "male")

Running result

1 (2, 3, 4, 5) {'name': 'Xiaoming', 'gender': 'male'}

Multi-valued parameter case-calculate the sum of any number of numbers:

1. Define a function sum_numbers that can receive any number of integers

two。 Functional requirements: accumulate all the numbers passed and return the cumulative result.

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