diff --git a/tools/python/jwutils/algo/ShuntingYard.py b/tools/python/jwutils/algo/ShuntingYard.py
index 61ebf24..caaef18 100644
--- a/tools/python/jwutils/algo/ShuntingYard.py
+++ b/tools/python/jwutils/algo/ShuntingYard.py
@@ -27,6 +27,9 @@ class Stack:
     def __init__(self, itemlist=[]):
         self.items = itemlist
 
+    def __repr__(self):
+        return str(self.items)
+
     def isEmpty(self):
         if self.items == []:
             return True
@@ -45,8 +48,7 @@ class Stack:
 class ShuntingYard(object): # export
 
     def __init__(self, operators = None):
-        self.do_debug = False
-        #self.do_debug = True
+        self.do_debug = prio_gets_logged(DEBUG)
         self.__ops = {}
         if operators is not None:
             for k, v in operators.items():
@@ -238,7 +240,7 @@ class ShuntingYard(object): # export
 
             op = self.__ops[token]
             args = []
-            self.debug("Adding %d arguments" % (op.nargs))
+            self.debug(f'Adding {op.nargs} arguments: {vals}')
             for i in range(0, op.nargs):
                 self.debug("Adding argument %d" % (i))
                 args.append(vals.pop())
@@ -253,7 +255,7 @@ class ShuntingYard(object): # export
         if not isinstance(infix, basestring):
             return infix
         postfix = self.infix_to_postfix(infix)
-        self.debug(infix, "-->", postfix)
+        self.debug(f'"{infix}" --> {postfix}')
         for token in postfix:
             self.debug("Token is %s" % (token))
         return self.eval_postfix(postfix)