use-sequence-for-iteration / C0208¶

Message emitted:

Use a sequence type when iterating over values

Description:

When iterating over values, sequence types (e.g., ``lists``, ``tuples``, ``ranges``) are more efficient than ``sets``.

Problematic code:

for food in {"apples", "lemons", "water"}:  # [use-sequence-for-iteration]
    print(f"I like {food}.")

Correct code:

list.py:

for food in ["apples", "lemons", "water"]:
    print(f"I like {food}.")

tuple.py:

for food in ("apples", "lemons", "water"):
    print(f"I like {food}.")

Additional details:

This example script shows a significant increase in performance when using a list, tuple or range over a set in python version 3.11.1.

Created by the refactoring checker.