Reference library

Comprehensions & generators

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

1 match
Comprehensions & generators easy

How to Generate Fibonacci Numbers in Python Without Recursion

Build an efficient infinite Fibonacci sequence using a generator function with O(1) memory and no recursion overhead.

generators fibonacci iteration
Python 
def fib(n):
    a, b = 0, 1
    for _ in range(n):
        yield a
        a, b = b, a + b

if __name__ == "__main__":
    count = 10
    result = list(fib(count))
    print(result)
15 0 Open

Browse by section

Each section groups closely related Python snippets.

Comprehensions & generators — Python code examples

What you will find here

This page collects comprehensions & generators snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

Samples vs tutorials and challenges

Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup. Python code samples Copy-ready snippets to study and run in the IDE.