fix: Fix getting params defaults on Python 3.7

src/griffe/agents/nodes.py

@@ -1178,6 +1178,8 @@ def get_parameter_default(node: AST, filepath: Path, lines_collection: LinesColl
         return None
     if isinstance(node, NodeConstant):
         return repr(node.value)
+    if isinstance(node, NodeStr):
+        return repr(node.s)
     if isinstance(node, NodeName):
         return node.id
     if node.lineno == node.end_lineno:  # type: ignore[attr-defined]

tests/test_functions.py

@@ -8,6 +8,18 @@
 from tests.helpers import temporary_visited_module
 
 
+def test_visit_simple_function():
+    """Test functions parameters loading."""
+    with temporary_visited_module("def f(foo='<>'): ...") as module:
+        function = module["f"]
+        assert len(function.parameters) == 1
+        param = function.parameters[0]
+        assert param is function.parameters["foo"]
+        assert param.name == "foo"
+        assert param.kind is ParameterKind.positional_or_keyword
+        assert param.default == "'<>'"
+
+
 @pytest.mark.skipif(sys.version_info < (3, 8), reason="posonly syntax not supported on Python 3.7")
 def test_visit_function_positional_only_param():
     """Test functions parameters loading."""