Python list Method - index()

The index() method in Python is a built-in method used to get the index of the first occurrence of an element in a list.

Syntax:

list_name.index(element, start, end)

Here, element is the element whose index is to be found, start is the optional starting index (inclusive), and end is the optional ending index (exclusive) of the search. If element is not found in the list, a ValueError is raised.

Example:

my_list = [1, 2, 3, 2]
print(my_list.index(2))   # Output: 1

In the above example, the index() method is used to find the index of the first occurrence of the element 2 in the list my_list. The method returns the index 1, which is the index of the first occurrence of 2 in my_list.

We can also provide the optional start and end arguments to limit the search to a specific range in the list. For example,

my_list = [1, 2, 3, 2]
print(my_list.index(2, 2))   # Output: 3

In the above example, the index() method is used to find the index of the first occurrence of the element 2 in the list my_list, starting the search from the index 2. The method returns the index 3, which is the index of the first occurrence of 2 after the index 2 in my_list.