Last index of element in list Python

To get the last element of the list in Python, we have two ways.

1. Using list[-1] syntax and I am assuming that you have a non-empty list.
2. Using list.pop[] method.

Let’s see these approaches one by one.

Python list last element

To get the last element of the list in Python, use the list[-1] syntax. The list[-n] syntax gets the nth-to-last element. So list[-1] gets the last element, list[-2] gets the second to last. The list[-1] is the most preferable, shortest, and Pythonic way to get the last element.

To create a list in Python, use the square brackets and add the items in the list separated by commas.

data = ["infy", "tcs", "affle", "dixon", "astral"]

In this list, the “astral” element is the last item, and to access that element, write the following code.

last_element = data[-1]

What this code will do is that it will pluck the last element and store it into the last_element, and we can print the element using the print[] function.

data = ["infy", "tcs", "affle", "dixon", "astral"] last_element = data[-1] print[last_element]

Output

astral

Python: Get index of item in List

To find index of element in list in python, we are going to use a function list.index[],

list.index[]

Python’s list data type provides this method to find the first index of a given element in list or a sub list i.e.

list.index[x[, start[, end]]]

Arguments :

• x : Item to be searched in the list
• start : If provided, search will start from this index. Default is 0.
• end : If provided, search will end at this index. Default is the end of list.

Returns: A zero based index of first occurrence of given element in the list or range. If there is no such element then it raises a ValueError.

Important Point : list.index[] returns the index in a 0 based manner i.e. first element in the list has index 0 and second element in index is 1.

Let’s use this function to find the indexes of a given item in the list,

Suppose we have a list of strings,

# List of strings list_of_elems = ['Hello', 'Ok', 'is', 'Ok', 'test', 'this', 'is', 'a', 'test', 'Ok']

Now let’s find the index of the first occurrence of item ‘Ok‘ in the list,

elem = 'Ok' # Find index position of first occurrence of 'Ok' in the list index_pos = list_of_elems.index[elem] print[f'First Index of element "{elem}" in the list : ', index_pos]

Output

First Index of element "Ok" in the list : 1

As in the list.index[] we did not provided start & end arguments, so it searched for the ‘Ok‘ in the complete list. But returned the index position as soon as it encountered the first occurrence of ‘Ok‘ in the list.

But if searched item doesn’t exists in the list, then index[] will raise ValueError. Therefore we need to be ready for this kind of scenario. For example,

list_of_elems = ['Hello', 'Ok', 'is', 'Ok', 'test', 'this', 'is', 'a', 'test', 'Ok'] elem = 'Why' try: index_pos = list_of_elems.index[elem] print[f'First Index of element "{elem}" in the list : ', index_pos] except ValueError as e: print[f'Element "{elem}" not found in the list: ', e]

Output

Element "Why" not found in the list: 'Why' is not in list

As ‘Why‘ was not present in the list, so list.index[] raised ValueError.

Get last item of a list using negative indexing

List in python supports negative indexing. So, if we have a list of size “S”, then to access the Nth element from last we can use the index “-N”. Let’s understand by an example,
Suppose we have a list of size 10,

sample_list = [1, 2, 3, 4, 5, 6, 7, 8, 9]
To access the last element i.e. element at index 9 we can use the index -1,
# Get last element by accessing element at index -1 last_elem = sample_list[-1] print['Last Element: ', last_elem]
Output:
Last Element: 9
Similarly, to access the second last element i.e. at index 8 we can use the index -2.
last_elem = sample_list[-2]
Output:
Last Element: 8
Using negative indexing, you can select elements from the end of list, it is a very efficient solution even if you list is of very large size. Also, this is the most simplest and most used solution to get the last element of list. Let’s discuss some other ways,

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