Shulou(Shulou.com)06/02 Report--

In this issue, the editor will bring you about the parameters of the Python function. The article is rich in content and analyzed and described from a professional point of view. I hope you can get something after reading this article.

1. Required parameters:

The parameters must be passed into the function in the correct order, and the number of calls must be the same as when declared.

Def f (name,age): print ('I am% s Magi I am% dudes% (name,age)) f ('alex',18) f (' alvin',16)

Output:

I am alex,I am 18

I am alvin,I am 16

2 keyword parameters:

Keyword parameters are closely related to function calls, and function calls use keyword parameters to determine the passed-in parameter values. The use of keyword parameters allows the order of the parameters when the function is called to be inconsistent with that of the declaration, because the Python interpreter can match the parameter values with the parameter name.

Def f (name,age): print ('I am% s Magi I am% dudes% (name,age)) # f (16 minicalvin') # error f (age=16,name='alvin')

Output:

I am alvin,I am 16

3. Default parameters (default parameters):

When a function is called, the value of the default parameter is considered the default if it is not passed in. The following example prints the default age if age is not passed in:

Def print_info (name, age, sex='male'): print ('Name:%s'% name) print (' age:%s'% age) print ('Sex:%s'% sex) returnprint_info (' alex', 18) print_info ('Xiaoming', 40, 'female')

Output:

Name:alex

Age:18

Sex:male

Name: Xiao Ming

Age:40 S

Ex:female

4. Variable length parameter

You may need a function that can handle more parameters than when it was originally declared. These parameters are called indefinite length parameters, and unlike the above two parameters, they are not named when declared.

# def add (XMague y): # return x+ydef add (* tuples): sum=0 for v in tuples: sum+=v return sumprint (add (1, 4, 6, 9) print (add (1, 4, 6, 9, 5))

Output:

twenty

twenty-five

Variable names with an asterisk * hold all unnamed variable parameters, while variable names with * * hold named variable parameters.

Def print_info (* * kwargs): print (kwargs) for i in kwargs: print ('% slug% s'% (I, kwargs [I])) # returnprint_info (name=' Xiaoming', age=18, sex='female', hobby='girl', nationality='Chinese') can print any relevant information according to the parameters. Ability='Python') # # location def print_info (name,* args,* * kwargs): # def print_info (name,**kwargs,*args): print ('Name:%s'% name) print (' args:', args) print ('kwargs:', kwargs) returnprint_info (' Xiaoming', 18, hobby='girl', nationality='Chinese') Ability='Python') # print_info (hobby='girl',', hobby='girl',18,nationality='Chinese',ability='Python') # error # ("Xiaoming", hobby='girl',18,nationality='Chinese',ability='Python') # error

Output:

{'name':' Xiaoming', 'age': 18,' sex': 'female',' hobby': 'girl',' nationality': 'Chinese',' ability': 'Python'}

Name: Xiao Ming

Age:18

Sex:female

Hobby:girl

Nationality:Chinese

Ability:Python

Name: Xiao Ming

Args: (18,)

Kwargs: {'hobby':' girl', 'nationality':' Chinese', 'ability':' Python'}

Note that you can also pass parameters like this:

A: there are no answers to problems encountered in study. The editor has created a Python learning exchange group: 725638078 look for like-minded partners to help each other, and there are also good video learning tutorials and PDF e-books in the group! Def f (* args): print (args) f (* [1,2,5]) def f (* * kargs): print (kargs) f (* * {'name':' Xiao Ming'})

Output:

(1, 2, 5)

{'name':' Xiao Ming'}

5. Higher order function

A function that meets at least one of the following conditions:

Accept one or more functions as input

Output a function

Def add: return f (x) + f (y) res = add print (res) # def foo (): Xero3 def bar (): return x return bar

Output:

nine

These are the parameters of the Python function shared by the editor. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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