fix: replace deprecated ast.* literal types with ast.Constant

nemo_run/cli/cli_parser.py

@@ -518,8 +518,8 @@ def _contains_unsafe_operations(self, node: ast.AST) -> bool:
             return self._contains_unsafe_operations(node.operand)
         elif isinstance(node, (ast.List, ast.Tuple, ast.Set, ast.Dict)):
             return any(self._contains_unsafe_operations(elt) for elt in ast.iter_child_nodes(node))
-        elif isinstance(node, (ast.Num, ast.Str, ast.Bytes, ast.NameConstant, ast.Ellipsis)):
-            # Allow basic literals
+        elif isinstance(node, ast.Constant):
+            # Allow basic literals (numbers, strings, bytes, True/False/None, Ellipsis)
             return False
         return True
 

nemo_run/cli/lazy.py

@@ -833,8 +833,8 @@ def _load_entrypoint_from_script(script_content: str, module_name: str = "__dyna
             if (
                 isinstance(node.test.left, ast.Name)
                 and node.test.left.id == "__name__"
-                and isinstance(node.test.comparators[0], ast.Str)
-                and node.test.comparators[0].s == "__main__"
+                and isinstance(node.test.comparators[0], ast.Constant)
+                and node.test.comparators[0].value == "__main__"
             ):
                 main_block = node.body
                 break

test/cli/test_ast_constants.py

@@ -0,0 +1,41 @@
+# SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import ast
+
+import pytest
+
+from nemo_run.cli.cli_parser import PythonicParser
+
+
+class TestPythonicParserLiteralSafety:
+    @pytest.fixture
+    def parser(self):
+        return PythonicParser()
+
+    @pytest.mark.parametrize(
+        "expression",
+        [
+            "1",
+            "'hello'",
+            "b'hello'",
+            "True",
+            "None",
+            "...",
+        ],
+    )
+    def test_literal_expressions_are_safe(self, parser, expression):
+        """Literal expressions previously checked via deprecated ast.* types."""
+        assert parser._contains_unsafe_operations(ast.parse(expression, mode="eval").body) is False