What are negative indexes in Python?

In Python, negative indexing is a powerful feature that enables developers to access elements starting from the end of a sequence. For instance, in a list, positive indexing begins at 0 and extends to (length - 1). With negative indexing, -1 refers to the last element, -2 to the second-to-last, and so forth. This feature is especially handy when you need to quickly access or manipulate elements at the end of a list. For example, if you have a list containing several elements and you want to retrieve the last element for processing, negative indexing allows you to directly access it via list[-1] without first determining the list's length. Here's a practical example to demonstrate this:

python
# Assume a list containing some numbers
numbers = [10, 20, 30, 40, 50]

# Access the last element using positive indexing
last_item_positive_index = numbers[len(numbers) - 1]

# Access the last element using negative indexing
last_item_negative_index = numbers[-1]

print("Last element accessed with positive indexing:", last_item_positive_index)
print("Last element accessed with negative indexing:", last_item_negative_index)

In this example, both positive and negative indexing yield the last element of the list, which is 50. However, negative indexing is more straightforward and concise. This can enhance coding efficiency, particularly when working with complex or dynamically changing data structures.