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List Comprehensions in Python: A Complete Guide
Everything about list comprehensions in one place: how the syntax maps to a loop, where if and if-else go (and the SyntaxError when they are swapped), nested loops in the right order, dict and set comprehensions, generator expressions for large data, the walrus operator, and the point where a plain loop reads better.
Python Iterators vs Generators vs Comprehensions
The same task written as an iterator class, a generator function, a generator expression and a list comprehension, then measured for time and peak memory. The numbers show why lists cost memory, why generators do not, when a class is worth its extra code, and how to choose between the four.