Iterators in Python: How the for Loop and next Method Work

Published: 21 February 2026
on channel: dZenPy
10
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Let's take a look under the hood of Python! 🏎 Find out what actually happens when you run a regular loop and how to teach your classes to return data one at a time.

In this episode:
✅ Concept Analysis: What's the difference between an iterable and an iterator?
✅ The _next_ Method: How step-by-step iteration works.
✅ StopIteration: Why it's not an error, but an important signal.
✅ Custom Iterators: Writing your own class for generating data.
✅ Lazy Evaluation: How to process millions of rows without freezing your computer.

Make your code faster and more efficient using the power of Python protocols!

Link to the previous lesson:    • Полиморфизм в Python простыми словами: Duc...  

✍️ Cheat sheet for the lesson on the blog: pythonflashcards.blogspot.com

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