@qdegraaf has shown interest in working on this

You can find the dummy implementation here

ruff/crates/ruff_python_formatter/src/expression/expr_yield.rs

Lines 1 to 25 in 76e9ce6

    
           use crate::context::PyFormatContext; 
        
           use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses}; 
        
           use crate::{not_yet_implemented, FormatNodeRule, PyFormatter}; 
        
           use ruff_formatter::{write, Buffer, FormatResult}; 
        
           use ruff_python_ast::node::AnyNodeRef; 
        
           use rustpython_parser::ast::ExprYield; 
        
           #[derive(Default)] 
        
           pub struct FormatExprYield; 
        
           impl FormatNodeRule<ExprYield> for FormatExprYield { 
        
               fn fmt_fields(&self, item: &ExprYield, f: &mut PyFormatter) -> FormatResult<()> { 
        
                   write!(f, [not_yet_implemented(item)]) 
        
               } 
        
           } 
        
           impl NeedsParentheses for ExprYield { 
        
               fn needs_parentheses( 
        
                   &self, 
        
                   _parent: AnyNodeRef, 
        
                   _context: &PyFormatContext, 
        
               ) -> OptionalParentheses { 
        
                   OptionalParentheses::Multiline 
        
               } 
        
           }

I recommend taking a look at the raise stmt PR #5595 and/or formatting of await expressions because I assume the formatting would be similar.

Oh, and I should not forget the documentation

	use crate::context::PyFormatContext;
	use crate::expression::parentheses::{NeedsParentheses, OptionalParentheses};
	use crate::{not_yet_implemented, FormatNodeRule, PyFormatter};
	use ruff_formatter::{write, Buffer, FormatResult};
	use ruff_python_ast::node::AnyNodeRef;
	use rustpython_parser::ast::ExprYield;

	#[derive(Default)]
	pub struct FormatExprYield;

	impl FormatNodeRule<ExprYield> for FormatExprYield {
	fn fmt_fields(&self, item: &ExprYield, f: &mut PyFormatter) -> FormatResult<()> {
	write!(f, [not_yet_implemented(item)])
	}
	}

	impl NeedsParentheses for ExprYield {
	fn needs_parentheses(
	&self,
	_parent: AnyNodeRef,
	_context: &PyFormatContext,
	) -> OptionalParentheses {
	OptionalParentheses::Multiline
	}
	}

Formatter: Yield / YieldFrom (good first issue) #5916

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Formatter: `Yield` / `YieldFrom` (good first issue) #5916