none-not-at-end-of-union (RUF036)
This rule is unstable and in preview. The --preview flag is required for use.
What it does
Checks for type annotations where None is not at the end of an union.
Why is this bad?
Type annotation unions are associative, meaning that the order of the elements
does not matter. The None literal represents the absence of a value. For
readability, it's preferred to write the more informative type expressions first.
Example
Use instead: