python - 单个函数的参数数量可变

Question

我尝试了一些代码，但没有得到满意的答案。代码的输出应该是来自调用站点的确切数字参数:

>>> def  Hello(PitU,*V):
    print("you passed" , PitU,"Arguments")
    for Pit in V:
        print(Pit)

#case1      
>>> Hello(3,"one","two","three")
you passed 3 Arguments
one
two
three

#case2
>>> Hello(3,"one","two")
you passed 3 Arguments
one
two

#case3
>>> Hello(3,"one","two","three","four")
you passed 3 Arguments
one
two
three
four
>>> 

我希望输出是:

A. case-1
you passed 3 Arguments
one
two
three

B. case-2
error

C. case-3
error

instead of 

Case1
you passed 3 Arguments
one
two
three

case2
you passed 3 Arguments
one
two

case3
you passed 3 Arguments
one
two
three
four

Answer 1

为此你需要自己检查，python 不会为你做。

def Hello(PitU, *V): 
    if len(V) != PitU:
        print("error")
        return
    print("you passed", PitU, "Arguments") 
    for Pit in V: 
        print(Pit)