Check if the first and last number of a list is the same in Python

Python | Get first and last elements of a list

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:

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:

To print the last element use :

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 :

Output

Program to find a sublist where first and last values are same in Python

Suppose we have a list of numbers called nums, we have to find the number of sublists where the first element and the last element are same.

So, if the input is like nums = [10, 15, 13, 10], then the output will be 5, as the sublists with same first and last element are: [10], [15], [13], [10], [10, 15, 13, 10].

To solve this, we will follow these steps −

• num_sublists := size of nums

• d := an empty map

• for each n in nums, do

  • d[n] := d[n] + 1

• for each number k and corresponding frequency v of elements in d, do

  • if v is not same as 1, then

    • num_sublists := num_sublists +(quotient of (v-1) *(v) /2)

• return num_sublists

Let us see the following implementation to get better understanding −

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check if element are same using all()

Let’s convert the list to Iterable and check if each entry of iterable is equal to first element of list using all() i.e.

''' check if element are same using all() It will Iterate through all the elements in list and check if all elements are similar to first element or not. ''' result = False; if len(listOfStrings) > 0 : result = all(elem == listOfStrings[0] for elem in listOfStrings) if result : print("All Elements in List are Equal") else: print("All Elements in List are Not Equal")

9. Lists¶

A list is an ordered set of values, where each value is identified by an index. The values that make up a list are called its elements. Lists are similar to strings, which are ordered sets of characters, except that the elements of a list can have any type. Lists and strings — and other things that behave like ordered sets — are called sequences.