Description

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Intermediate · 10 min

List comprehensions

Build transformed and filtered lists with a compact expression.

Transform a list

A list comprehension creates a new list by evaluating an expression for every item. Read it from left to right: result expression, loop, then the source collection.

prices = [3, 5, 8]
doubled = [price * 2 for price in prices]
print(doubled)

Output

[6, 10, 16]

Filter while building

Add an if clause to keep only values that meet a condition. The original list is left unchanged.

scores = [48, 75, 62, 91]
passed = [score for score in scores if score >= 60]
print(passed)

Output

[75, 62, 91]

List comprehensions

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

Try it yourself

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Prepare a price list

Use a list comprehension to create discounted from prices by subtracting 2 from each price. Display the new list.

Practice