Replace inspect.stack() with inspect.currentframe()
diff --git a/parameterized/parameterized.py b/parameterized/parameterized.py
index 5a3d428..59ea471 100644
--- a/parameterized/parameterized.py
+++ b/parameterized/parameterized.py
@@ -495,9 +495,7 @@
         name_func = name_func or default_name_func
 
         def parameterized_expand_wrapper(f, instance=None):
-            stack = inspect.stack()
-            frame = stack[1]
-            frame_locals = frame[0].f_locals
+            frame_locals = inspect.currentframe().f_back.f_locals
 
             parameters = cls.input_as_callable(input)()