Python – Negative index of Element in List

When it is required to get the negative index of an element in a list, the ‘len’ method and the ‘index’ method are used.

Below is a demonstration of the same −

Example

 Live Demo

my_list = [52, 47, 18, 22, 23, 57, 13]

print("The list is :")
print(my_list)

my_key = 22
print("The value of key is ")
print(my_key)

my_result = len(my_list) - my_list.index(my_key)

print("The result is :")
print(my_result)

Output

The list is :
[52, 47, 18, 22, 23, 57, 13]
The value of key is
22
The result is :
4

Explanation

• A list of integers is defined and is displayed on the console.

• A key is defined and is displayed on the console.

• The difference between the length of the list and element present at specific key is determined.

• This is assigned to a variable.

• This is displayed as output on the console.