deprecate some useless, noop methods in symtable

Doc/library/symtable.rst

@@ -144,15 +144,6 @@ Examining Symbol Tables
 
       Return ``True`` if the symbol is global.
 
-   .. method:: is_vararg()
-
-      Return ``True`` if the symbol is a star arg (receives varargs).
-
-   .. method:: is_kewordarg()
-
-      Return ``True`` if the symbol is a two-star arg (receives keyword
-      arguments).
-
    .. method:: is_local()
 
       Return ``True`` if the symbol is local to its block.

Lib/symtable.py

@@ -2,11 +2,10 @@
 
 import _symtable
 from _symtable import (USE, DEF_GLOBAL, DEF_LOCAL, DEF_PARAM,
-     DEF_STAR, DEF_DOUBLESTAR, DEF_INTUPLE, DEF_FREE,
+     DEF_IMPORT, DEF_BOUND, OPT_IMPORT_STAR, OPT_EXEC, OPT_BARE_EXEC,
-     DEF_FREE_GLOBAL, DEF_FREE_CLASS, DEF_IMPORT, DEF_BOUND,
+     SCOPE_OFF, SCOPE_MASK, FREE, GLOBAL_IMPLICIT, GLOBAL_EXPLICIT)
-     OPT_IMPORT_STAR, OPT_EXEC, OPT_BARE_EXEC, SCOPE_OFF, SCOPE_MASK,
-     FREE, GLOBAL_IMPLICIT, GLOBAL_EXPLICIT)
 
+import warnings
 import weakref
 
 __all__ = ["symtable", "SymbolTable", "newSymbolTable", "Class",
@@ -194,10 +193,14 @@ class Symbol(object):
         return bool(self.__scope in (GLOBAL_IMPLICIT, GLOBAL_EXPLICIT))
 
     def is_vararg(self):
-        return bool(self.__flags & DEF_STAR)
+        warnings.warn("is_vararg() is obsolete and will be removed",
+                      DeprecationWarning, 2)
+        return False
 
     def is_keywordarg(self):
-        return bool(self.__flags & DEF_DOUBLESTAR)
+        warnings.warn("is_keywordarg() is obsolete and will be removed",
+                      DeprecationWarning, 2)
+        return False
 
     def is_local(self):
         return bool(self.__flags & DEF_BOUND)
@@ -212,7 +215,8 @@ class Symbol(object):
         return bool(self.__flags & DEF_LOCAL)
 
     def is_in_tuple(self):
-        return bool(self.__flags & DEF_INTUPLE)
+        warnings.warn("is_in_tuple() is obsolete and will be removed",
+                      DeprecationWarning, 2)
 
     def is_namespace(self):
         """Returns true if name binding introduces new namespace.

Lib/test/test_symtable.py

@@ -55,6 +55,22 @@ class SymtableTest(unittest.TestCase):
     internal = find_block(spam, "internal")
     foo = find_block(top, "foo")
 
+    def test_noops(self):
+        # Check methods that don't work. They should warn and return False.
+        def check(w, msg):
+            self.assertEqual(str(w.message), msg)
+        sym = self.top.lookup("glob")
+        with test_support.catch_warning() as w:
+            warnings.simplefilter("always", DeprecationWarning)
+            self.assertFalse(sym.is_vararg())
+            check(w, "is_vararg() is obsolete and will be removed")
+            w.reset()
+            self.assertFalse(sym.is_keywordarg())
+            check(w, "is_keywordarg() is obsolete and will be removed")
+            w.reset()
+            self.assertFalse(sym.is_in_tuple())
+            check(w, "is_in_tuple() is obsolete and will be removed")
+
     def test_type(self):
         self.assertEqual(self.top.get_type(), "module")
         self.assertEqual(self.Mine.get_type(), "class")

Misc/NEWS

@@ -54,6 +54,9 @@ Core and Builtins
 Library
 -------
 
+- The methods ``is_in_tuple()``, ``is_vararg()``, and ``is_keywordarg()`` of
+  symtable.Symbol have been deprecated for removal in 3.0 and the next release.
+
 - Issue #2234: distutils failed for some versions of the cygwin compiler. The
   version reported by these tools does not necessarily follow the python
   version numbering scheme, so the module is less strict when parsing it.