gh-143504: Expose CELL status of a symbol in symtable (GH-143504)

Lib/symtable.py

@@ -229,6 +229,10 @@ def get_frees(self):
             self.__frees = self.__idents_matching(is_free)
         return self.__frees
 
+    def get_cells(self):
+        """Return a list of cell variable names in the table."""
+        return [s.get_name() for s in self.get_symbols() if s.is_cell()]
+
 
 class Class(SymbolTable):
 
@@ -342,6 +346,10 @@ def is_free(self):
         """
         return bool(self.__scope == FREE)
 
+    def is_cell(self):
+        """Return *True* if the symbol is a cell variable."""
+        return bool(self.__scope == CELL)
+
     def is_free_class(self):
         """Return *True* if a class-scoped symbol is free from
         the perspective of a method."""

Lib/test/test_symtable.py

@@ -284,6 +284,20 @@ def test_local(self):
     def test_free(self):
         self.assertTrue(self.internal.lookup("x").is_free())
 
+    def test_cells(self):
+        #test for addition of is_cell() and get_cells()
+        #see https://github.com/python/cpython/issues/143504
+        code="""def outer():
+                    x=1
+                    def inner():
+                        return x"""
+
+        top=symtable.symtable(code,"?","exec")
+        outer = find_block(top, "outer")
+        self.assertIn("x",outer.get_cells())
+        self.assertTrue(outer.lookup("x").is_cell())
+        self.assertFalse(outer.lookup("inner").is_cell())
+
     def test_referenced(self):
         self.assertTrue(self.internal.lookup("x").is_referenced())
         self.assertTrue(self.spam.lookup("internal").is_referenced())

Misc/NEWS.d/next/Core_and_Builtins/2026-01-08-16-28-03.gh-issue-143504.PlC_Yv.rst

@@ -0,0 +1 @@
+Add symtable.is_cell() and get_cells() methods for cell variable analysis.