Adds a __getattr__ dunder to ValueHolder to enable getting attributes, and especially method calls, on contained objects.

bonobo/util/objects.py

@@ -142,10 +142,10 @@ class ValueHolder:
         return divmod(other, self._value)
 
     def __pow__(self, other):
-        return self._value**other
+        return self._value ** other
 
     def __rpow__(self, other):
-        return other**self._value
+        return other ** self._value
 
     def __ipow__(self, other):
         self._value **= other
@@ -225,6 +225,9 @@ class ValueHolder:
     def __setitem__(self, key, value):
         self._value[key] = value
 
+    def __getattr__(self, item):
+        return getattr(self._value, item)
+
 
 def get_attribute_or_create(obj, attr, default):
     try: