imp(node.py): Add pathlib.PosixPath to safe save types

ntc/node.py

@@ -3,7 +3,7 @@
 import inspect
 import logging
 from collections import UserDict
-from pathlib import Path
+from pathlib import Path, PosixPath
 from typing import Any, Callable, Dict, List, Tuple, Union
 
 import yaml
@@ -394,6 +394,9 @@ def _update_module(self, full_key: str, value) -> None:
             lines.append(f"{full_key} = {value.__name__}\n")
         elif type(value) in [int, float, str]:
             lines.append(f"{full_key} = {value!r}\n")
+        elif type(value) == PosixPath:
+            lines.append("from pathlib import PosixPath\n")
+            lines.append(f"{full_key} = {value!r}\n")
         elif isinstance(value, CfgSavable):
             import_str, cls_name, args, kwargs = value.save_strs()
             lines.append(f"{import_str}\n")

tests/data/good/save_safe_types.py

@@ -0,0 +1,12 @@
+from pathlib import Path
+
+from ntc import CN
+from tests.data.base_cfg import cfg
+from tests.data.base_class import BaseClass
+
+cfg = CN(cfg)
+cfg.NEW.int = 1
+cfg.NEW.str = "foo"
+cfg.NEW.float = 3.14
+cfg.NEW.path = Path("example")
+cfg.NEW.type = BaseClass

tests/test_good.py

@@ -101,9 +101,7 @@ def test_new_allowed():
 def test_save_modify(tmp_path):
     cfg = CN.load(DATA_DIR / "good.py")
     cfg.DICT.INT = 2
-    cfg.DICT.FOO = "bar"
     cfg.CLASS = SavableClass(dt.date(2021, 1, 1))
-    cfg.SUBCLASS = SubClass
 
     save_path = tmp_path / "good.py"
     cfg.save(save_path)
@@ -133,3 +131,15 @@ def test_save_clone(tmp_path):
     cfg.save(save_path)
     cfg2 = CN.load(save_path)
     assert cfg == cfg2
+
+
+@pytest.mark.parametrize(
+    "name, value", {"int": 2, "str": "bar", "float": 2.71, "path": Path("another"), "type": SubClass}.items()
+)
+def test_save_safe_types(tmp_path, name, value):
+    cfg = CN.load(DATA_DIR / "save_safe_types.py")
+    setattr(cfg.NEW, name, value)
+    save_path = tmp_path / "save_safe_types.py"
+    cfg.save(save_path)
+    cfg2 = CN.load(save_path)
+    assert cfg == cfg2