如何在Python列表中找到元素[1]的正索引

Question

如何找到myList[-1]的正索引？
这是我想要的一个例子：

输入：

myList = [1, 2, 3, 4, 3]
# Please keep in mind that the list can have multiple values that are the same

myIndex = # Find out the positive index of myList[-1] and store in myIndex variable
print(myIndex)

期望输出：

4

Answer 1

那么是,

myList = [1, 2, 3, 4, 3]
index = len(myList) - 1

您可能需要检查它是否大于或等于零