How do I find the last number in a list Python?

In Python, how do you get the last element of a list?

To just get the last element,

• without modifying the list, and
• assuming you know the list has a last element [i.e. it is nonempty]

pass -1 to the subscript notation:

>>> a_list = ['zero', 'one', 'two', 'three'] >>> a_list[-1] 'three'

Python | How to get the last element of list

List, being an essential python container is used in day-day programming and also in web-development. Knowledge of its operations is necessary.

Let’s see all the different ways of accessing the last element of a list.

Method #1 : Naive Method

There can be 2-naive methods to get the last element of the list.

• Iterating the whole list and getting, the second last element.
• Reversing the list and printing the first element.

# Python 3 code to demonstrate # accessing last element of list # using naive method # initializing list test_list = [1, 4, 5, 6, 3, 5] # printing original list print ["The original list is : " + str[test_list]] # First naive method # using loop method to print last element for i in range[0, len[test_list]]: if i == [len[test_list]-1]: print ["The last element of list using loop : " + str[test_list[i]]] # Second naive method # using reverse method to print last element test_list.reverse[] print["The last element of list using reverse : " + str[test_list[0]]]

Output :

The original list is : [1, 4, 5, 6, 3, 5] The last element of list using loop : 5 The last element of list using reverse : 5

Method #2 : Using [] operator

The last element can be assessed easily if no. of elements in list are already known. There are 2 index in Python that point to last element in list.

• list[ len - 1 ] : Points to last element by definition.
• list[-1] : In python, negative indexing starts from end.

# Python3 code to demonstrate # accessing last element of list # using [] operator # initializing list test_list = [1, 4, 5, 6, 3, 5] # printing original list print ["The original list is : " + str[test_list]] # using len - 1 index to print last list element print ["The last element using [ len -1 ] is : " + str[test_list[len[test_list] -1]]] # using -1 index to print last list element print ["The last element using [ -1 ] is : " + str[test_list[-1]]]

Output :

The original list is : [1, 4, 5, 6, 3, 5] The last element using [ len -1 ] is : 5 The last element using [ -1 ] is : 5

Method #3 : Using list.pop[]

The list.pop[] method is used to access the last element of the list. The drawback of this approach is that it also deletes the list last element, hence is only encouraged to use when list is not to be reused.

# Python3 code to demonstrate # accessing last element of list # using list.pop[] # initializing list test_list = [1, 4, 5, 6, 3, 5] # printing original list print ["The original list is : " + str[test_list]] # using pop[] to print last list element print ["The last element using pop[] is : " + str[test_list.pop[]]]

Output :

The original list is : [1, 4, 5, 6, 3, 5] The last element using pop[] is : 5

Method #4 : Using reversed[] + next[]

reversed[] coupled with next[] can easily be used to get the last element, as like one of the naive method, reversed method returns the reversed ordering of list as an iterator, and next[] method prints the next element, in this case last element.

# Python3 code to demonstrate # accessing last element of list # using reversed[] + next[] # initializing list test_list = [1, 4, 5, 6, 3, 5] # printing original list print ["The original list is : " + str[test_list]] # using reversed[] + next[] to print last element print ["The last element using reversed[] + next[] is : " + str[next[reversed[test_list]]]]

Output :

The original list is : [1, 4, 5, 6, 3, 5] The last element using reversed[] + next[] is : 5

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How to get the last element of a list in Python?

PythonServer Side ProgrammingProgramming

Python sequence, including list object allows indexing. Any element in list can be accessed using zero based index. If index is a negative number, count of index starts from end. As we want last element in list, use -1 as index.

>>> L1=[1,2,3,4,5] >>> print [L1[-1]] 5

Malhar Lathkar

Published on 12-Jan-2018 19:20:43

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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,

Reading the First and Last Elements of a Python List

Elements in a list are numbered zero onwards. In this tutorial, we will learn different ways to access the first and the last elements from a list.

Let’s start by initializing a list.

1. Initialize a Python list

To initialize a list in Python use:

a = [6, 5, 9, 7]

This will initialize a new list ‘a‘ with the four elements we have mentioned.

2. Accessing list elements

You can access elements from the list by using the name of the list along with an index number. To print the first element use:

print[a[0]]

To print the last element use :

print[a[-1]]

Using -1 as the index gives us the last element from the list.

Python Code to Get First and Last Element of a List

The complete code is as follows :

a = [6, 5, 9, 7] print["first element is" ,a[0]] print["last element is", a[-1]]

Output

What is a List in Python?

The list is one of the most commonly used data types in Python. A list is a collection of elements that can be of any data type. A single list can contain a combination of numbers, strings, nested lists, etc.

How to Get the Last Element of a List in Python

Method 1 – By Iterating all the elements in a list

The most common and straightforward way to get last element in list is through iterating the entire element till it reaches the last element, as shown below.

# Python code to access the last element # in a list using for loop # Declaring and initializing list number_list = [2, 1, 7, 4, 5, 3,6] print ["List of elements are : " + str[number_list]] # using loop method to print last element for i in range[0, len[number_list]]: if i == [len[number_list]-1]: print ["The last element of list is : "+ str[number_list[i]]] # Output List of elements are : [2, 1, 7, 4, 5, 3, 6] The last element of list is : 6

Method 2 – Using the reverse[] method

The reverse[]method in Python is used to reverse the elements of a list. The reverse[] method does not take any arguments and does not return any values instead, it reverses the existing list.

# Python code to access the last element # in a list using reverse[] method # Declaring and initializing list number_list = [2, 1, 7, 4, 5, 3,6] print ["List of elements are : " + str[number_list]] # using reverse method to print last element number_list.reverse[] print["The last element of list using reverse method are : " + str[number_list[0]]] # Output List of elements are : [2, 1, 7, 4, 5, 3, 6] The last element of list using reverse method are : 6

Method 3 – Using pop[] method

The pop[] method is used to access the last element of the list and returns the removed item. Thepop[] method accepts an integer as the argument, which is basically the index of the item which needs to be removed from the list.

Example – list.pop[0] will remove and return the first element in the list.

Note – Calling the pop[]method will remove the last item from the list itself. Hence if you are re-using the list, this approach is not recommended as the element is removed.

# Python code to access the last element # in a list using pop[] method # Declaring and initializing list number_list = [2, 1, 7, 4, 5, 3,6] print ["List of elements are : " + str[number_list]] # using pop[] method to print last element print["The last element of list using reverse method are : " + str[number_list.pop[]]] # Output List of elements are : [2, 1, 7, 4, 5, 3, 6] The last element of list using reverse method are : 6

Method 4 – Using Negative Indexing [] Operator

The negative index is the way of indexing the element from the end of the list with an index starting from -1, i.e., -1 gives the last element, -2 gives the last 2nd element, and so on.

The major use of negative indexing can be used to reverse a list without using any built-in function.

You can also find the last element in the list using length-1. In order to access the last element, we need to know the length of the list.

# Python code to access the last element # in a list using negative indexing # Declaring and initializing list number_list = [2, 1, 7, 4, 5, 3,6] print ["List of elements are : " + str[number_list]] # using length-1 to print last element print["The last element of list using length-1 method are : " + str[number_list[len[number_list] -1]]] # using [] operator to print last element print["The last element of list using reverse method are : " + str[number_list[-1]]] # Output List of elements are : [2, 1, 7, 4, 5, 3, 6] The last element of list using length-1 method are : 6 The last element of list using reverse method are : 6

Method 5 – Using itemgetter[]

The operator module in Python has vast features to perform all mathematical, logical, comparison operations.

Theitemgetter[]method is one of the methods in the operator module, and it accepts one or more integer arguments and returns the callable object.

import operator # Python code to access the last element # in a list using itemgetter[] method # Declaring and initializing list number_list = [2, 1, 7, 4, 5, 3,6] print ["List of elements are : " + str[number_list]] getLastElement = operator.itemgetter[-1] # using [] operator to print last element print["The last element of list using reverse method are : " + str[getLastElement[number_list]]] # Output List of elements are : [2, 1, 7, 4, 5, 3, 6] The last element of list using reverse method are : 6