Reversing a list or array is a common programming task. There are many cases where you may need to present data in reverse order, such as when sorting a list.
How to reverse a list or array with Python? You will learn about different methods in this article.
make a copy of the for loop
Although the Python for loop is more verbose, it can be handy in some cases. For example, it provides more flexibility when performing complex logic at certain points in the reverse operation.
When using indentation for loops, the usual approach is to iterate through the original list in reverse order. Starting with the last element, each iteration then adds the previous element to a new list.
reverse a list or array using list comprehensions
A list comprehension gives shorter code. And there is no need for temporary variables because list views act on a list in place.
Use segment operator
The list segment operator is quite simple, although it has some limitations. For example, you may not be able to customize the output when using a for loop.
Use the reverse method for an array
Here’s another way that works: it modifies the original array. This can be a disadvantage as you cannot keep a backlist for other tasks.
use inverse function
The reverse function iterates over a list, array, or some other sequence and returns its reverse copy. However, you must explicitly declare the inverted output as a list.
get creative with arrays
Arrays or lists are common ways to store data. Depending on your goal, you may want to present the data to the client in reverse order. One way to do this is to reverse the array or list before rendering it. As you saw, there are a few ways to reverse a list in Python. Choose what works best for you and aligns with your logic for a specific problem.
You may also want to see How to reverse an array in other programming languages to better understand the logic behind it.