unnecessary-round (RUF057)

Fix is always available.

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for round() calls that have no effect on the input.

Why is this bad?

Rounding a value that's already an integer is unnecessary. It's clearer to use the value directly.

Example

a = round(1, 0)

Use instead:

a = 1

Fix safety

The fix is marked unsafe if it is not possible to guarantee that the first argument of round() is of type int, or if the fix deletes comments.