Which built-in function in Python can be used to iterate over elements with an index?

The built-in function that allows you to iterate over elements while keeping track of their index is enumerate(). This function takes an iterable, such as a list or a tuple, and returns an iterator that produces pairs of an index and the corresponding value from the iterable. This is particularly useful when you want both the index and the value in a loop, allowing for clearer and more concise code.

For example, using enumerate() in a loop allows you to write:

for index, value in enumerate(my_list):

print(index, value)

In this snippet, index captures the current index of the item, while value captures the actual item from my_list at that index. This greatly simplifies tasks that would otherwise require manually managing an index counter.

The other options do not serve the same purpose: index() is a method typically used to find the position of a specific value in a sequence. The functions enumerate_values() and index_of() are not built-in Python functions and do not exist in the standard library. Thus, the correct choice, due to its designed functionality for pairing each item with its index during iteration, is enumerate().