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Write a Python program to print the first and last element of the list

Python | Get first and last elements of a list

Sometimes, there might be a need to get the range between which a number lies in the list, for such applications we require to get the first and last element of the list. Let’s discuss certain ways to get the first and last element of the list.

Method #1 : Using list index
Using the list indices inside the master list can perform this particular task. This is most naive method to achieve this particular task one can think of.

# Python3 code to demonstrate

# to get first and last element of list

# using list indexing

# initializing list

test_list = [1, 5, 6, 7, 4]

# printing original list

print ("The original list is : " + str(test_list))

# using list indexing

# to get first and last element of list

res = [ test_list[0], test_list[-1] ]

# printing result

print ("The first and last element of list are : " + str(res))

Output: The original list is : [1, 5, 6, 7, 4] The first and last element of list are : [1, 4]

Method #2 : Using List slicing
One can also make use of list slicing technique to perform the particular task of getting first and last element. We can use step of whole list to skip to the last element after the first element.

# Python3 code to demonstrate

# to get first and last element of list

# using List slicing

# initializing list

test_list = [1, 5, 6, 7, 4]

# printing original list

print ("The original list is : " + str(test_list))

# using List slicing

# to get first and last element of list

res = test_list[::len(test_list)-1]

# printing result

print ("The first and last element of list are : " + str(res))

Output:

The original list is : [1, 5, 6, 7, 4] The first and last element of list are : [1, 4]

Method #3 : Using list comprehension
List comprehension can be employed to provide a shorthand to the loop technique to find first and last element of the list. Naive method of finding is converted to a single line using this method.

# Python3 code to demonstrate

# to get first and last element of list

# using list comprehension

# initializing list

test_list = [1, 5, 6, 7, 4]

# printing original list

print ("The original list is : " + str(test_list))

# using list comprehension

# to get first and last element of list

res = [ test_list[i] for i in (0, -1) ]

# printing result

print ("The first and last element of list are : " + str(res))

Output: The original list is : [1, 5, 6, 7, 4] The first and last element of list are : [1, 4]

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Python program to interchange first and last elements in a list

Given a list, write a Python program to swap first and last element of the list.

Examples:

Input : [12, 35, 9, 56, 24] Output : [24, 35, 9, 56, 12] Input : [1, 2, 3] Output : [3, 2, 1]

Approach #1: Find the length of the list and simply swap the first element with (n-1)th element.

Python3

# Python3 program to swap first

# and last element of a list

# Swap function

def swapList(newList):

size = len(newList)

# Swapping

temp = newList[0]

newList[0] = newList[size - 1]

newList[size - 1] = temp

return newList

# Driver code

newList = [12, 35, 9, 56, 24]

print(swapList(newList))

Output:

[24, 35, 9, 56, 12]

Approach #2: The last element of the list can be referred as list[-1]. Therefore, we can simply swap list[0] with list[-1].

Python3

# Python3 program to swap first

# and last element of a list

# Swap function

def swapList(newList):

newList[0], newList[-1] = newList[-1], newList[0]

return newList

# Driver code

newList = [12, 35, 9, 56, 24]

print(swapList(newList))

Output:

[24, 35, 9, 56, 12]

Approach #3: Swap the first and last element is using tuple variable. Store the first and last element as a pair in a tuple variable, say get, and unpack those elements with first and last element in that list. Now, the First and last values in that list are swapped.

Python3

# Python3 program to swap first

# and last element of a list

# Swap function

def swapList(list):

# Storing the first and last element

# as a pair in a tuple variable get

get = list[-1], list[0]

# unpacking those elements

list[0], list[-1] = get

return list

# Driver code

newList = [12, 35, 9, 56, 24]

print(swapList(newList))

Output:

[24, 35, 9, 56, 12]

Approach #4: Using * operand.
This operand proposes a change to iterable unpacking syntax, allowing to specify a “catch-all” name which will be assigned a list of all items not assigned to a “regular” name.

Python3

# Python3 program to illustrate

# the usage of * operarnd

list = [1, 2, 3, 4]

a, *b, c = list

print(a)

print(b)

print(c)

Output:

1 [2, 3] 4

Now let’s see the implementation of above approach:

Python3

# Python3 program to swap first

# and last element of a list

# Swap function

def swapList(list):

start, *middle, end = list

list = [end, *middle, start]

return list

# Driver code

newList = [12, 35, 9, 56, 24]

print(swapList(newList))

Output:

[24, 35, 9, 56, 12]

Approach #5: Swap the first and last elements is to use the inbuilt function list.pop(). Pop the first element and store it in a variable. Similarly, pop the last element and store it in another variable. Now insert the two popped element at each other’s original position.

Python3

# Python3 program to swap first

# and last element of a list

# Swap function

def swapList(list):

first = list.pop(0)

last = list.pop(-1)

list.insert(0, last)

list.append(first)

return list

# Driver code

newList = [12, 35, 9, 56, 24]

print(swapList(newList))

Output:

[24, 35, 9, 56, 12]

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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

Get first and last elements of a list in Python

PythonServer Side ProgrammingProgramming

There may be situation when you need to get the first and last element of the list. The tricky part here is you have to keep track of the length of the list while finding out these elements from the lists. Below are the approaches which we can use to achieve this. But of course all the approaches involve using the index of the elements in the list.

“python print first and last element of list” Code Answer

Python get first element from list

python by Hilarious Hoopoe on Sep 12 2020 Comment

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Python Program to Interchange First and Last Elements in list

In this tutorial, you will learn how to interchange the first and the last elements in a list in Python. Lists in Python are a group of ordered values that are closed within a square[] bracket. For a given list, we have to write a Python program that will swap the first and the last elements of a list. Swapping means exchanging the values of the two numbers. Suppose you have two variables a and b. The value of a is 40 and the value of b is 30. After swapping the value of a will become 30 and the value of b will become 40.

For a list a[ ]= [1, 2, 3, 4, 5], swap elements at position 1 and position 5

To get the final list as a[]=[5,2,3,4,1]

Get the last element of a list using indexing in Python

Indexing in python is a way to access elements from a list. In python, we can use positive indices as well as negative indices. Positive indices start with zero which corresponds to the first element of the list and the last element of the list is identified by the index “listLen-1” where “listLen” is the length of the list.

Alternatively, negative indices start from -1 which corresponds to the last element of the list. It goes till “-listLen” where listLen is the length of the list. The index “-listLen” corresponds to the first element in the list.

To get the last element of a list, we can first find the length of the list using the len() function. Then we can access the last element of the list at the index “listLen-1” as follows.

myList = [1, 2, 3, 4, 5, 6, 7] print("Given List is:", myList) listLen = len(myList) lastElement = myList[listLen - 1] print("Last element of the list is:", lastElement)

Output:

Given List is: [1, 2, 3, 4, 5, 6, 7] Last element of the list is: 7

Alternatively, we can use negative indexing to access the last element of the list. The last element of the list is at index -1 which can be accessed as follows.

myList = [1, 2, 3, 4, 5, 6, 7] print("Given List is:", myList) lastElement = myList[- 1] print("Last element of the list is:", lastElement)

Output:

Given List is: [1, 2, 3, 4, 5, 6, 7] Last element of the list is: 7

We can see that while using negative indexing, we don’t have to calculate the length of the list.

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

Python program to interchange first and last element in a list

Here, we will write a Python program in which we will interchange the first and list element of the list.
Submitted by Shivang Yadav, on April 06, 2021

Python programming language is a high-level and object-oriented programming language. Python is an easy to learn, powerful high-level programming language. It has a simple but effective approach to object-oriented programming.

List is a sequence data type. It is mutable as its values in the list can be modified. It is a collection of ordered sets of values enclosed in square brackets [].

Python program to interchange first and last element in last

In this program, we will swap the first and last elements of the list.

Example:

Input: [4, 1, 7, 3, 90, 23, 56] Output: [56, 1, 7, 3, 90, 23, 4]

Solution Approach:

We will simply need to swap elements at the first index with the element at the last index in the list.

Python provides multiple ways to perform the task. Let's see them,

Method 1:

In this method, we will find the length of the list. And then swap the element at index 0 and element at index (length - 1).

Algorithm:

Find the length of the list
Swap values at list[0] and list[len - 1]
- temp = list[0]
- list[0] = list[length - 1]
- list[length - 1] = temp
Return the list

Program to interchange first and last element in the list

# Python program to interchange the # first and last element of a list # Creating a list myList = [1, 7, 3, 90, 23, 4] print("Initial List : ", myList) # finding the length of list length = len(myList) # Swapping first and last element temp = myList[0] myList[0] = myList[length - 1] myList[length - 1] = temp print("List after Swapping : ", myList)

Output:

Initial List : [1, 7, 3, 90, 23, 4] List after Swapping : [4, 7, 3, 90, 23, 1]

Method 2:

Another method to interchange values is using Python's shorthand technique to find the last element. And then swapping them.

The last element can be found using list[-1].

Algorithm:

swap -> list[0] and list[-1].
- temp = list[-1]
- list[-1] = list[-0]
- list[0] = temp
Print list

Program to interchange first and last element in the list

# Python program to interchange the # first and last element of a list # Creating a list myList = [1, 7, 3, 90, 23, 4] print("Initial List : ", myList) # Swapping first and last element temp = myList[-1] myList[-1] = myList[0] myList[0] = temp print("List after Swapping : ", myList)

Output:

Initial List : [1, 7, 3, 90, 23, 4] List after Swapping : [4, 7, 3, 90, 23, 1]

Method 3:

In this method, we will use the comma assignment method from python. Here, we will store the first and last element tuple to the last and first element tuple.

Syntax:

list[0], list[-1] = list[-1], list[0]

Program to interchange first and last element in a list

# Python program to interchange the # first and last element of a list # Creating a list myList = [1, 7, 3, 90, 23, 4] print("Initial List : ", myList) # Swapping first and last element myList[0], myList[-1] = myList[-1], myList[0] print("List after Swapping : ", myList)

Output:

Initial List : [1, 7, 3, 90, 23, 4] List after Swapping : [4, 7, 3, 90, 23, 1]

Method 4:

One more method, can be deleting the elements from the list and then inserting them back in the desired position.

Here, we will delete (pop) the first and the last elements of the list and insert them back as the first element at the last position and last element at the first position.

Algorithm:

Swap values
- firstVal = list.pop(0)
- lastVal = list.pop(-1)
- list.insert(0, lastVal)
- list.append(firstVal)
Print list

Program to interchange first and last element in a list

# Python program to interchange the # first and last element of a list # Creating a list myList = [1, 7, 3, 90, 23, 4] print("Initial List : ", myList) # Swapping first and last element firstVal = myList.pop(0) lastVal = myList.pop(-1) myList.insert(0, lastVal) myList.append(firstVal) print("List after Swapping : ", myList)

Output:

Initial List : [1, 7, 3, 90, 23, 4] List after Swapping : [4, 7, 3, 90, 23, 1]

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