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This article shares the content of an example analysis of function parameter calls and non-fixed parameters. Xiaobian thinks it is quite practical, so share it with everyone for reference. Let's follow Xiaobian and have a look.

def test(x,y,z): #this adds parameters

print(x)

print(y)

print(z)

test(1,2,3) #Add arguments here

1. Formal parameters and actual parameters 2. Position parameters and keywords

#test(1,2)#position parameter call: real participation parameter one-to-one correspondence, cannot be more, cannot be less

#test(y=1,x=2)#keyword: independent of parameter order

#test(y=1,x=2,1)#Keyword arguments cannot precede positional arguments

#test(1,z=2,y=5)

3. Default parameters: When calling a function, the default function can be optional. Usage: 1. Default installation value 2. Fixed default value

def test(x,y=2):

print(x)

print(y)

test(1,y=3)

Parameter group: parameter group should be placed at the end, such as test3 (name,x=2,*args)

#def test(*gg): #Accepts any number of arguments, in tuple form

print(gg)

test(1,2,3,4,5,5,5,5,5,7,9)

test(*[1,2,3,4,5]) # gg=tuple([1,2,3,4,5])

*args: Accepts n positional parameters, converts to tuples

def test(x,args): #sign represents function

print(x)

print(args)

#test(1,2,3,4,5,6,7)

#test([1,2,3,4,5,6,7]) #args=*[1,2,3,4,5,6,7]

Accepts n keyword parameters and converts them to dictionary form

def test1(**kwargs):!

print(kwargs)

print(kwargs["name"])

print(kwargs["age"])

test1(name="alex",age=8) #Convert n keyword parameters to dictionary

test1(**{"name":"alex","age":"8"})

Position parameters and keyword parameters

#def test3(name,**kwargs):

print(name)

print(kwargs)

test3("alex",age=18,sex="m")

Default parameters, location parameters, keyword parameters

def test3(name,x=2,**kwargs):

print(name)

print(x)

print(kwargs)

test3("alex",age=18,sex="m",x=4)

def test3(name,x=2,*args,**kwargs):

print(name)

print(x)

print(args)

print(kwargs)

test3("alex",age=18,sex="m",x=4)

Summary: positional parameters are passed only to formal parameters and *args, keyword parameters are passed to *kwargs!

Args will convert n positional parameters into the original form!

**kwargs converts n keyword arguments into dictionary form! m='alex'(m is key,'alex' is values)

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