Explain list comprehensions with a practical example.

Explain list comprehensions with a practical example and one readability warning.

Expected Answer

A list comprehension builds a new list from an iterable, optionally filtering values.

Detailed Explanation

The best answers show a tiny example and note that nested or overly clever comprehensions should usually be rewritten as normal loops.

Common Follow-up Questions

• When should you avoid comprehensions?
• How do generator expressions differ?