Lazy Iterators v List Comprehensions in Python

A lazy iterator in Python is often implemented using a generator expression, denoted by (...).

A generator expression is similar to a list comprehension but produces values lazily, one at a time, as they are requested.

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#iterators #tutorial #pythonprogrammingtutorial

[juliandeal]

Just defining this iterator is of course blazingly fast but evaluating is not faster.

The lazy iterator is just an EXPRESSION that gets evaluated when you run list(lazy_iterator). This will take about as much time as running the list comprehension because then you are actually calculating and storing these values.

In other words list(lazy_iterator) is actually just a list comprehension in disguise.

The lazy iterator is indeed actually useful if you don‘t need to store all values of the expression you are iterating over.