Using NameConstant instead of ast.NameConstant.

dace/frontend/python/memlet_parser.py

@@ -16,6 +16,22 @@
 MemletType = Union[ast.Call, ast.Attribute, ast.Subscript, ast.Name]
 
 
+if sys.version_info < (3, 8):
+    _simple_ast_nodes = (ast.Constant, ast.Name, ast.NameConstant, ast.Num)
+    BytesConstant = ast.Bytes
+    EllipsisConstant = ast.Ellipsis
+    NameConstant = ast.NameConstant
+    NumConstant = ast.Num
+    StrConstant = ast.Str
+else:
+    _simple_ast_nodes = (ast.Constant, ast.Name)
+    BytesConstant = ast.Constant
+    EllipsisConstant = ast.Constant
+    NameConstant = ast.Constant
+    NumConstant = ast.Constant
+    StrConstant = ast.Constant
+
+
 @dataclass
 class MemletExpr:
     name: str
@@ -125,7 +141,7 @@ def _fill_missing_slices(das, ast_ndslice, array, indices):
                 ndslice[j] = (0, array.shape[j] - 1, 1)
                 idx += 1
                 new_idx += 1
-        elif (dim is None or (isinstance(dim, (ast.Constant, ast.NameConstant)) and dim.value is None)):
+        elif (dim is None or (isinstance(dim, (ast.Constant, NameConstant)) and dim.value is None)):
             new_axes.append(new_idx)
             new_idx += 1
             # NOTE: Do not increment idx here