Скачать или смотреть Python Trick: Using itertools.tee to Duplicate Iterators

Iterators in Python are consumed once, which means once you iterate over them, you can't go back or use them again. A lesser-known but very useful trick is using itertools.tee to create independent copies of an iterator, allowing you to iterate over the same data multiple times without exhausting the original iterator.

How It Works: itertools.tee allows you to create multiple iterators from a single iterable. Each copy can be consumed independently, meaning you can iterate over the same data multiple times without re-creating the original iterable.

Why It’s Cool: itertools.tee is a great solution when you need to iterate over the same data multiple times, but don’t want to regenerate the data or store it in memory. It’s especially useful when working with large datasets or streams of data, as it provides a memory-efficient way to duplicate iterators.

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