bpo-44142: drop redundant parantheses when unparsing tuples as assignment targets (GH-26156)

Lib/test/test_ast.py

@@ -702,7 +702,8 @@ class AST_Tests(unittest.TestCase):
     def test_precedence_enum(self):
         class _Precedence(enum.IntEnum):
             """Precedence table that originated from python grammar."""
-            TUPLE = enum.auto()
+            NAMED_EXPR = enum.auto()      # <target> := <expr1>
+            TUPLE = enum.auto()           # <expr1>, <expr2>
             YIELD = enum.auto()           # 'yield', 'yield from'
             TEST = enum.auto()            # 'if'-'else', 'lambda'
             OR = enum.auto()              # 'or'