python - python程序中出现 "List Reversing"错误

Question

大家好! 我是 python 编程的初学者。我正在编写一个 python 程序来反转给定的输入列表。下面是它的代码:

    L1=list(input("Enter the numbers of list to be reversed : "))
    L2=[]

    def rever(La,Lb):
     if len(Lb)==0: 
      return La                               
     else:
      return rever(La.append(Lb.pop(0)),Lb)

    print rever(L2,L1)

例如，如果我们输入，

    1,2,3

输出应该是，

    [3,2,1]

但这并没有发生。 Python 给出以下错误:

    Traceback (most recent call last):
      File "Q3.py", line 10, in <module>
        print rever(L2,L1)
      File "Q3.py", line 8, in rever
        return rever(La.append(Lb.pop(0)),Lb)
      File "Q3.py", line 8, in rever
        return rever(La.append(Lb.pop(0)),Lb)
    AttributeError: 'NoneType' object has no attribute 'append'

我不明白。请帮帮我!!

Answer 1

也许你应该看看这个，而不是弹出和追加

In [5]: L1=list(input("Enter the numbers of list to be reversed : "))
Enter the numbers of list to be reversed : 1,2,3,4,5

In [6]: L1
Out[6]: [1, 2, 3, 4, 5]

In [7]: L2 = L1[::-1]

In [8]: L2
Out[8]: [5, 4, 3, 2, 1]