Split tuples in return positions by comma first (#8280)

crates/ruff_python_formatter/resources/test/fixtures/ruff/statement/return.py

@@ -14,3 +14,35 @@ return (
     len(node.parents) for node in self.node_map.values()
     )
 )
+
+# Regression tests for https://github.com/astral-sh/ruff/issues/8042
+def f():
+    return (
+        self.get_filename() + ".csv" +
+        "text/csv" +
+        output.getvalue().encode("utf-8----------------"),
+    )
+
+
+def f():
+    return (
+        self.get_filename() + ".csv" + "text/csv",
+        output.getvalue().encode("utf-8----------------")
+    )
+
+def f():
+    return (
+        self.get_filename() + ".csv",
+        "text/csv",
+        output.getvalue().encode("utf-8----------------")
+    )
+
+
+def f():
+    return self.get_filename() + ".csv" + "text/csv" + output.getvalue().encode("utf-8----------------"),
+
+def f():
+    return self.get_filename() + ".csv" + "text/csv", output.getvalue().encode("utf-8----------------")
+
+def f():
+    return self.get_filename() + ".csv", "text/csv", output.getvalue().encode("utf-8----------------")

crates/ruff_python_formatter/src/expression/expr_tuple.rs

@@ -172,10 +172,13 @@ impl FormatNodeRule<ExprTuple> for FormatExprTuple {
                         .finish()
                 }
                 TupleParentheses::Preserve => group(&ExprSequence::new(item)).fmt(f),
-                TupleParentheses::NeverPreserve | TupleParentheses::OptionalParentheses => {
+                TupleParentheses::NeverPreserve => {
                     optional_parentheses(&ExprSequence::new(item)).fmt(f)
                 }
-                TupleParentheses::Default => {
+                TupleParentheses::OptionalParentheses if item.elts.len() == 2 => {
+                    optional_parentheses(&ExprSequence::new(item)).fmt(f)
+                }
+                TupleParentheses::Default | TupleParentheses::OptionalParentheses => {
                     parenthesize_if_expands(&ExprSequence::new(item)).fmt(f)
                 }
             },

crates/ruff_python_formatter/tests/snapshots/format@statement__return.py.snap

@@ -20,6 +20,38 @@ return (
     len(node.parents) for node in self.node_map.values()
     )
 )
+
+# Regression tests for https://github.com/astral-sh/ruff/issues/8042
+def f():
+    return (
+        self.get_filename() + ".csv" +
+        "text/csv" +
+        output.getvalue().encode("utf-8----------------"),
+    )
+
+
+def f():
+    return (
+        self.get_filename() + ".csv" + "text/csv",
+        output.getvalue().encode("utf-8----------------")
+    )
+
+def f():
+    return (
+        self.get_filename() + ".csv",
+        "text/csv",
+        output.getvalue().encode("utf-8----------------")
+    )
+
+
+def f():
+    return self.get_filename() + ".csv" + "text/csv" + output.getvalue().encode("utf-8----------------"),
+
+def f():
+    return self.get_filename() + ".csv" + "text/csv", output.getvalue().encode("utf-8----------------")
+
+def f():
+    return self.get_filename() + ".csv", "text/csv", output.getvalue().encode("utf-8----------------")
 ```
 
 ## Output
@@ -38,6 +70,54 @@ return (
     len(self.nodeseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee),
     sum(len(node.parents) for node in self.node_map.values()),
 )
+
+
+# Regression tests for https://github.com/astral-sh/ruff/issues/8042
+def f():
+    return (
+        self.get_filename()
+        + ".csv"
+        + "text/csv"
+        + output.getvalue().encode("utf-8----------------"),
+    )
+
+
+def f():
+    return (
+        self.get_filename() + ".csv" + "text/csv",
+        output.getvalue().encode("utf-8----------------"),
+    )
+
+
+def f():
+    return (
+        self.get_filename() + ".csv",
+        "text/csv",
+        output.getvalue().encode("utf-8----------------"),
+    )
+
+
+def f():
+    return (
+        self.get_filename()
+        + ".csv"
+        + "text/csv"
+        + output.getvalue().encode("utf-8----------------"),
+    )
+
+
+def f():
+    return self.get_filename() + ".csv" + "text/csv", output.getvalue().encode(
+        "utf-8----------------"
+    )
+
+
+def f():
+    return (
+        self.get_filename() + ".csv",
+        "text/csv",
+        output.getvalue().encode("utf-8----------------"),
+    )
 ```