python – How to obtain the last index of a list?

python – How to obtain the last index of a list?

len(list1)-1 is definitely the way to go, but if you absolutely need a list that has a function that returns the last index, you could create a class that inherits from list.

class MyList(list):
    def last_index(self):
        return len(self)-1


>>> l=MyList([1, 2, 33, 51])
>>> l.last_index()
3

the best and fast way to obtain the content of the last index of a list is using -1 for number of index ,
for example:

my_list = [0, 1, test, 2, hi]
print(my_list[-1])

Output is: hi.

Index -1 shows you the last index or first index of the end.

But if you want to get only the last index, you can obtain it with this function:

def last_index(input_list:list) -> int:
    return len(input_list) - 1

In this case, the input is the list, and the output will be an integer which is the last index number.

python – How to obtain the last index of a list?

Did you mean len(list1)-1?

If youre searching for other method, you can try list1.index(list1[-1]), but I dont recommend this one. You will have to be sure, that the list contains NO duplicates.