How Can I Efficiently Access Index Values While Iterating in Python's `for` Loop?

Accessing Index Values in Python's 'for' Loop

When traversing a sequence with a for loop, obtaining the current index may prove useful. However, accessing this index can be tricky.

Inefficient Manual Indexing

One common approach is to manually track the index using a separate counter or index variable:

xs = [8, 23, 45]
for i in range(len(xs)):
    print("item #{} = {}".format(i, xs[i]))

However, this approach is verbose and prone to errors.

Elegant Solution with 'enumerate()'

Python provides a built-in function, enumerate(), that elegantly solves this issue. It returns a sequence of tuples, where each tuple contains the current index and the corresponding element:

for idx, x in enumerate(xs):
    print("item #{} = {}".format(idx, x))

By utilizing this function, you can access both the index and the element directly, ensuring efficient and error-free indexing.

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