Stop Manually Tracking Indexes in Python Loops — Use enumerate() Instead

A cleaner way to get both the index and value from an iterable without maintaining a counter variable

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Imagine you want to loop through a list. You don’t just want the items from the list, but also their positions (indexes).

The traditional way to do this is to use a counter variable and manually update it inside the loop while printing its value, like this:

words = ['python', 'for', 'everything']

i = 0  # Counter variable

for word in words:
    print(i, word)
    i += 1  # Update the counter variable

While this works, it can quickly become messy and error-prone as loops grow larger or more complex.

Python provides a much cleaner solution for this: enumerate().

Let’s break it down!

What is enumerate() in Python and How to Use It?

enumerate() is a built-in Python function that lets you iterate over a collection of items. At each iteration, it returns a tuple. This tuple contains:

1. the index number of the item
2. the item itself

For example, let’s rewrite the earlier example code using enumerate():

words = ['python', 'for', 'everything']

for i, word in enumerate(words):
    print(i, word)

Output:

0 python
1 for
2 everything

By default, enumerate() starts counting from 0. You can change this by using the start parameter:

words = ['python', 'for', 'everything']

# Start index from 1
for i, word in enumerate(words, start=1):
    print(i, word)

Output:

1 python
2 for
3 everything

Wrap Up

At first glance, enumerate() might seem like a small helper function, but it can save you a lot of effort and help you avoid messy, unnecessary loops when tracking indexes in Python. Start using it regularly, and your future self will thank you.

A Note from the Author

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