Add method signature inspection to filter kwargs

Add method/function to check if the called method
accepts kwargs or not.

Author: elevans

src/scyjava/_convert.py

@@ -3,6 +3,7 @@
 """
 
 import collections
+import inspect
 import typing
 from pathlib import Path
 from typing import Any, Callable, NamedTuple
@@ -36,12 +37,23 @@ class Converter(NamedTuple):
 def _convert(obj: Any, converters: typing.List[Converter], **kwargs: dict) -> Any:
     suitable_converters = filter(lambda c: c.predicate(obj), converters)
     prioritized = max(suitable_converters, key=lambda c: c.priority)
-    if kwargs:
+    # check if select converter supports kwargs
+    if _check_func_uses_kwargs(prioritized.converter):
         return prioritized.converter(obj, **kwargs)
     else:
         return prioritized.converter(obj)
 
 
+def _check_func_uses_kwargs(func):
+    if isjava(func):
+        return False
+    else:
+        return any(
+            p.kind == inspect.Parameter.VAR_KEYWORD
+            for p in inspect.signature(func).parameters.values()
+        )
+
+
 # -- Python to Java --
 
 # Adapted from code posted by vslotman on GitHub: