python 传参中的*和**

def show_1(**kargs):
    for item in kargs.items():
        print(item)
user_dict = {'k1':123,'k2':456}

show_1(**user_dict)  #kargs=user_dict
show_1(k1=123,k2=456,k3=789)  #kargs=dict(k1=123,k2=456,k3=789)


def show_2(*args):
    for item in args:
        print(item)
user_list = ['rain','cloud','sun']

show_2(*user_list)  #args=user_list
show_2('rain','cloud')  #args=['rain','cloud']
show_2(user_list)  #args=[user_list]