How To Iterate Backwards In Python

One common task in Python programming is iterating through a data structure in reverse order. In this tutorial, we will learn how to iterate backward in Python.

Steps:

Step 1: Using the reversed() function

Python provides a built-in function called reversed() which allows us to iterate through a sequence in reverse order. The reversed() function returns a reverse iterator that can be used in a for loop.

Step 2: Using slice notation

Another way to iterate through a sequence in reverse order is by using slice notation. Slice notation allows us to select a subset of a sequence by specifying a start, stop, and step. If we set the step to -1, the slice will include elements in reverse order.

Step 3: Using the range() function

We can also use the range() function to iterate through a sequence in reverse order. By specifying a start and stop value and setting the step to -1, the range() function will generate a sequence of integers in reverse order.

Full code:

Conclusion

Iterating through a sequence in reverse order is a common task in Python programming. We can use the reversed() function, slice notation, or the range() function to achieve this. Remember to choose the method that suits your needs and programming style.