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Avoid syntax error when formatting attribute expressions with outer parentheses, parenthesized value, and trailing comment on value (#20418)

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Closes #19350 

This fixes a syntax error caused by formatting. However, the new tests reveal that there are some cases where formatting attributes with certain comments behaves strangely, both before and after this PR, so some more polish may be in order.

For example, without parentheses around the value, and both before and after this PR, we have:

```python
# unformatted
variable = (
    something # a comment
    .first_method("some string")
)

# formatted
variable = something.first_method("some string")  # a comment
```

which is probably not where the comment ought to go.
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Dylan 2025-11-17 09:11:36 -06:00 • committed by GitHub
parent d063c71177
commit 8156b45173
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17
crates/ruff_python_formatter/src/expression/expr_attribute.rs
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@ -179,7 +179,22 @@ impl NeedsParentheses for ExprAttribute {
context.comments().ranges(),
context.source(),
) {
OptionalParentheses::Never
// We have to avoid creating syntax errors like
// ```python
// variable = (something) # trailing
// .my_attribute
// ```
// See https://github.com/astral-sh/ruff/issues/19350
if context
.comments()
.trailing(self.value.as_ref())
.iter()
.any(|comment| comment.line_position().is_end_of_line())
{
OptionalParentheses::Multiline
} else {
OptionalParentheses::Never
}
} else {
self.value.needs_parentheses(self.into(), context)
}