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Comprehensions & generators

List/dict/set comprehensions, generator expressions, and lazy iteration.

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Comprehensions & generators easy

How to Sort Data with Comprehensions and Generators in Python

Sort a list of tuples by a key, then use a list comprehension to extract names and a generator to square high ranks.

sorting list-comprehension generator
Python 
data = [("Anna", 3), ("Ben", 1), ("Clara", 2), ("Dan", 5), ("Eve", 4)]

# Comprehension: list of tuples (name, rank) sorted ascending by rank
sorted_by_rank = sorted(data, key=lambda x: x[1])

# Comprehension: extract just the names in rank order
names_in_rank_order = [name for name, rank in sorted_by_rank]

# Generat…
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