Reference library

Comprehensions & generators

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

1 match
Comprehensions & generators easy

How to Generate Permutations of Length r in Python

Generate all ordered arrangements of length r from a given list of elements using itertools.permutations.

permutations itertools combinatorics
Python 
from itertools import permutations

def generate_permutations(elements, r):
    """Generate all r-length permutations of the given elements."""
    return list(permutations(elements, r))

if __name__ == "__main__":
    elements = ['A', 'B', 'C']
    r = 2
    result = generate_permutations(elements, r)
    print(f"Ele…
14 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.