函数的动态参数与命名空间 day9

一、动态参数(不定长参数)def func(*args):

形参: 3种 动态参数*args 动态参数,不定长参数

*rarge用法

def func(*args):
    print(args,type(args))
func(1,2,‘alex‘,3,4,5,6,8,4,7,2)

结果

*args按位置对应不能放到，其他形参位置前边

def func(*args,a,b,c):
    print(a)
    print(b)
    print(c)
    print(args,type(args))
func(1,2,‘alex‘,3,4,)

结果

正确用法

def func(a,b,c,*args):
    print(a)
    print(b)
    print(c)
    print(args,type(args))
func(1,2,‘alex‘)

结果

位置参数,*args,默认参数,**kwargs

def func(a,b,c,sex = ‘男‘,*args):
    print(a)
    print(b)
    print(c)
    print(sex)
    print(args,type(args))
func(1,2,‘alex‘,‘wusir‘,‘ritian ‘

结果

sex=‘男’被wusir覆盖

def func(a,b,c,*args,sex = ‘男‘):
    print(a)
    print(b)
    print(c)
    print(sex)
    print(args,type(args))
func(1,2,‘alex‘,‘wusir‘,‘ritian ‘,sex=‘女‘)

结果

**kwargs的用法

def func(**kwargs):
    print(kwargs)
func(a = 1,b = 4,c = 3,d = 2)

结果

def func(a,b,c,*args,sex = ‘男‘,**kwargs):
    print(a)
    print(b)
    print(c)
    print(sex)
    print(args,type(args))
    print(kwargs)
func(1,2,‘alex‘,‘wusir‘,‘ritian ‘,sex = ‘女‘,name = ‘taibai‘,age = 21)

结果

*args,**kwargs万能参数

def func2(*args,**kwargs):
    #万能参数
    print(args)
    print(kwargs)
func2(1,2,3,5,name=‘alex‘,age=56)

结果

*rags加法计算器

def my_sum(*args):
    count = 0
    for i in args:
        count += i
    return count
print(my_sum(1,2,3,6,78))
print(sum([1,2,3]))

结果

*魔法运算：打散

def func2(*args,**kwargs):
    print(args)
    #(1,2,3)
l1 = [1,2,3,]
l2 = [1,2,3,2,3,100,2]
func2(*l2,*l1)

结果

def func3(*args,**kwargs):
    print(args)
    print(kwargs)
dic = {‘name‘:‘alex‘,‘age‘:12}
dic2 = {‘name‘:‘jin‘,‘age‘:22}
func3(**{‘name1‘:‘alex‘,‘age1‘:12},**{‘name2‘:‘jin‘,‘age2‘:22},name3 = ‘wusir‘)

结果

def func3(*args,**kwargs):
    print(args)
    print(kwargs)
dic = {‘name‘:‘alex‘,‘age‘:12}
dic2 = {‘name‘:‘jin‘,‘age‘:22}
func3(**{‘name1‘:‘alex‘,‘age1‘:12},**{‘name2‘:‘jin‘,‘age2‘:22},name3 = ‘wusir‘)

结果

args元组,他包含了你所有的位置参数.**kwargs 他包含了关键动态参数

原文地址：https://www.cnblogs.com/chongdongxiaoyu/p/8400746.html