Reverted change about raising NotImplemented

1 files changed, 4 insertions, 4 deletions

diff --git a/scss/types.py b/scss/types.py
index 65ef9a8..7b0f4f1 100644
--- a/scss/types.py
+++ b/scss/types.py
@@ -78,7 +78,7 @@ class Value(object):
         return self.__div__(other)
 
     def __mul__(self, other):
-        raise NotImplementedError("__mul__(%s, %s)" % (self.__class__.__name__, other.__class__.__name__))
+        return NotImplemented
 
     def __pos__(self):
         return String("+" + self.render())
@@ -288,7 +288,7 @@ class Number(Value):
 
     def __mul__(self, other):
         if not isinstance(other, Number):
-            raise NotImplementedError("__mul__(%s, %s)" % (self.__class__.__name__, other.__class__.__name__))
+            return NotImplemented
 
         amount = self.value * other.value
         numer = self.unit_numer + other.unit_numer
@@ -298,7 +298,7 @@ class Number(Value):
 
     def __div__(self, other):
         if not isinstance(other, Number):
-            raise NotImplementedError("__div__(%s, %s)" % (self.__class__.__name__, other.__class__.__name__))
+            return NotImplemented
 
         amount = self.value / other.value
         numer = self.unit_numer + other.unit_denom
@@ -319,7 +319,7 @@ class Number(Value):
     def _add_sub(self, other, op):
         """Implements both addition and subtraction."""
         if not isinstance(other, Number):
-            raise NotImplementedError("%s(%s, %s)" % (op.name, self.__class__.__name__, other.__class__.__name__))
+            return NotImplemented
 
         # If either side is unitless, inherit the other side's units.  Skip all
         # the rest of the conversion math, too.