Python函数传递 *args，**kwargs

Python *args，**kwargs
函数传递中 *args，**kwargs含义是什么

• 用来处理可变参数
• *ags被打包成tuple
• **kwaegs被打包成dict

def print_multiple_args(*args):
    print(type(args),args) 
    for idx,val in enumerate(args):
        print(idx,val)  
print_multiple_args(‘a’,’b’,’c’)

(‘a’, ‘b’, ‘c’)
0 a
1 b
2 c

def print_kwargs(**kwargs):
    print(type(kwargs),kwargs) 
    for k,v in kwargs.items():
        print('{}:{}'.format(k,v))  
        
print_kwargs(a=1,b=2)

{‘a’: 1, ‘b’: 2}
a:1
b:2

可以灵活控制，不确定参数。

def print_all(a,*args,**kwargs):
    print(a)
    if args:
        print(args)
    if kwargs:
        print(kwargs)
    
print_all('hello','world',name = 'erfan')

def print_multiple_args(*args):
    print(type(args),args) 
    for idx,val in enumerate(args):
        print(idx,val)  
print_multiple_args(*['a','b','c'])

def print_kwargs(**kwargs):
    print(type(kwargs),kwargs) 
    for k,v in kwargs.items():
        print('{}:{}'.format(k,v))  
        
#关键字参数**
print_kwargs(**dict(a=1,b=2))