Python练习函数的参数

def f1(a,b,c=0,*args,**kw):
    print('a=',a,'b=',b,'c=',c,'args=',args,'kw=',kw)
def f2 (a,b,c=0,*,d,**kw):
    print('a=',a,"b=",b,'c=',c,d,'kw=',kw)
    
f1("zs","hsdf",c=12)
a= zs b= hsdf c= 12 args= () kw= {}

f1("zs","hsdf",3,(1,2,3),kw='jac')
a= zs b= hsdf c= 3 args= ((1, 2, 3),) kw= {'kw': 'jac'}

f1("zs","hsdf",3,"dsf","dsf",kw='jac')
a= zs b= hsdf c= 3 args= ('dsf', 'dsf') kw= {'kw': 'jac'}

f1("zs","hsdf",3,"dsf","dsf","dsffd",kw='jac')
a= zs b= hsdf c= 3 args= ('dsf', 'dsf', 'dsffd') kw= {'kw': 'jac'}

f1("zs","hsdf",3,"dsf","dsf","dsffd",kw='jac',ke='df')
a= zs b= hsdf c= 3 args= ('dsf', 'dsf', 'dsffd') kw= {'kw': 'jac', 'ke': 'df'}

f1("zs","hsdf",3,"dsf","dsf","dsffd",k='jac',ke='df',fc='kk')
a= zs b= hsdf c= 3 args= ('dsf', 'dsf', 'dsffd') kw= {'k': 'jac', 'fc': 'kk', 'ke': 'df'}

f2("df","sdf",d=4,sdf="sdf",dsj=[1,2],jfj=3,sdjfh=(12,3))
a= df b= sdf c= 0 4 kw= {'sdf': 'sdf', 'dsj': [1, 2], 'jfj': 3, 'sdjfh': (12, 3)}

 

args=(1,2,34)
kw={'d':99,'x':'#'}

f1(*args,**kw)
a= 1 b= 2 c= 3 args= (4,) kw= {'d': 99, 'x': '#'}
这里可以理解*为可变参数，**kw为关键字参数，可变参数就是数量可变，所以可以用元组传入，关键字参数因为有名字和对应的数值两部分，正好就是dict,key-value对应

 

 

def h(*y):
    he=1
    for i in y:
        he=i*he
    return (he)
计算多个数乘，原本he写在外边，结果报错，好像在外边，他就不认识了，明白了，写在外面他就不是不这个函数里面的，也就是没办法用。