Python Select List Elements By Index

Last Updated : Mar 11, 2024

In this article we will show you the solution of python select list elements by index, you can access particular values within a list depending on their position in Python by choosing list elements by index.

In lists, which are arranged collections of items, the first entry is given an index of 0, and so on.

You can retrieve the matching element from the list by supplying the index. Square bracket notation can be used in Python to select list entries based on an index.

For example, you would type "my_list[2]" if you had a list called "my_list" and wanted to obtain the entry at index 2.

You will receive the value for that specific index as a result. It's significant to remember that indices can be either positive or negative.

The last element is represented by -1 for negative indices, which begin at the end of the list.

Therefore, my_list[-1] would return the list's final entry. Now move to the concept of python select list elements by index.

Step By Step Guide On Python Select List Elements By Index :-

```# Create a list of fruits
fruits = ["apple", "banana", "cherry", "date", "elderberry"]
# Select individual elements by index
first_fruit = fruits[0]
second_fruit = fruits[1]
last_fruit = fruits[-1]
# Print the selected elements
print("First fruit:", first_fruit)
print("Second fruit:", second_fruit)
print("Last fruit:", last_fruit)
# Select a range of elements by index using slicing
selected_fruits = fruits[1:4] # Select elements from index 1 to 3
print("Selected fruits:", selected_fruits)
# Modify list elements by index
fruits[2] = "grape" # Change the element at index 2 to "grape"
print("Modified fruits:", fruits)```
1. We first make a list called fruits that contains the names of numerous fruits.
2. Our data source for choosing and changing items is this list.
3. We then choose each individual element by index.
4. To access particular elements within the list of fruits, we utilise the notation with square brackets.
5. For instance, we give the variable first_fruit the value fruits[0], which represents the list's first item.
6. Similar to this, we give second_fruit the value of end result[1] and last_fruit the price of end result[-1].
7. The remaining object within the listing is indicated with the aid of the poor index -1.
8. We use the print feature to show the values of the selected gadgets so that we will affirm them.
9. With first_fruit, second_fruit, and last_fruit, we output the first, second, and last fruit, respectively.
10. The idea of slicing, which enables us to choose a range of components by index, is then demonstrated.
11. Fruits[1:4] specifies the beginning and ending indices to build a new list called selected_fruits that contains items from index 1 to index 3.
12. Since the ending index is exclusive, all elements up to but excluding the element at index 4 are included.
13. Once more, we output the value of selected_fruits and then use print to display the fruits that were chosen.
14. Finally, we change an entry in the list of fruits by giving a particular index a new value.
15. To modify the element at position 2 to "grape," we use fruits[2] = "grape".
16. The third element's value is updated as a result of this operation, which modifies the existing list.
17. The altered contents of the list of fruits, which now contain "grape" as the third member, are then printed using print("Modified fruits:", fruits).

Conclusion :-

As a result, we have successfully learned how to pick list elements in Python by index.

We also discovered that a basic skill for working with lists in Python is choosing list elements by index.

In accordance with where they are in the list, it enables us to access particular elements.

I hope this article on python select list elements by index helps you and the steps and method mentioned above are easy to follow and implement.