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Intermediate · 12 min

Sorting with keys

Sort richer data by the field that matters.

Choose a sort key

The key function returns the value Python should compare. sorted() creates a new list.

names = ["Mina", "Al", "Sofia"]
print(sorted(names, key=len))

Output

['Al', 'Mina', 'Sofia']

Sort records

A lambda is a small unnamed function. Here it extracts each dictionary score for sorting.

players = [{"name": "Ada", "score": 8}, {"name": "Leo", "score": 12}]
ranked = sorted(players, key=lambda player: player["score"], reverse=True)
print(ranked[0]["name"])

Output

Leo

Sorting with keys

  1. Read both sorting with keys examples before answering.
  2. Run the task, compare its exact output, and revise the code if needed.

Try it yourself

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Rank products

Sort products from highest to lowest price and display the product names in that order.

Practice