访问python中的列表项

Question

以下代码正常工作，正如预期的那样（在数组中打印元素）：

arr = []
n = int(raw_input())
for i in range (0,n):
    num = int(raw_input())
    arr.append(num)

for i in range(0,n):
    print arr[i]

但是，当我尝试以相反的顺序打印数组元素时，

arr = []
n = int(raw_input())
for i in range (0,n):
    num = int(raw_input())
    arr.append(num)

for i in range(0,n):
    print arr[n-i] #notice this line

这给了我：IndexError: list index out of range。