How do I print the first and last elements of a 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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Get first and last elements of a list in Python

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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.

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

“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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Last update on October 08 2020 09:22:21 [UTC/GMT +8 hours]