Fixed str type fails to parse value when pyyaml raises ConstructorError

#189.

CHANGELOG.rst

@@ -12,6 +12,15 @@ The semantic versioning only considers the public API as described in
 paths are considered internals and can change in minor and patch releases.
 
 
+v4.16.1 (2022-11-??)
+--------------------
+
+Fixed
+^^^^^
+- ``str`` type fails to parse value when pyyaml raises ``ConstructorError``
+  `#189 <https://github.com/omni-us/jsonargparse/issues/189>`__.
+
+
 v4.16.0 (2022-10-28)
 --------------------
 

jsonargparse/loaders_dumpers.py

@@ -93,7 +93,7 @@ def jsonnet_load(stream, path='', ext_vars=None):
     'jsonnet': jsonnet_load,
 }
 
-pyyaml_exceptions = (yaml.parser.ParserError, yaml.scanner.ScannerError)
+pyyaml_exceptions = (yaml.YAMLError,)
 jsonnet_exceptions = pyyaml_exceptions + (ValueError,)
 
 loader_exceptions: Dict[str, Tuple[Type[Exception], ...]] = {

jsonargparse_tests/test_typehints.py

@@ -123,6 +123,12 @@ def __init__(self, val: str = '-'):
                     self.assertEqual(value, parser.parse_args([f'--cls.val={value}']).cls.init_args.val)
 
 
+    def test_str_with_yaml_constructor_error(self):
+        parser = ArgumentParser()
+        parser.add_argument('--val', type=str)
+        self.assertEqual('{{something}}', parser.parse_args(['--val={{something}}']).val)
+
+
     def test_list(self):
         for list_type in [Iterable, List, Sequence]:
             with self.subTest(str(list_type)):