normalized Type exception when casting Decimal type

aholmberg · aholmberg · commit cf41e80dfd00 · 2016-01-29T15:05:30.000-06:00
PYTHON-468
diff --git a/cassandra/cqltypes.py b/cassandra/cqltypes.py
@@ -369,7 +369,10 @@ def serialize(dec, protocol_version):
         try:
             sign, digits, exponent = dec.as_tuple()
         except AttributeError:
-            sign, digits, exponent = Decimal(dec).as_tuple()
+            try:
+                sign, digits, exponent = Decimal(dec).as_tuple()
+            except Exception:
+                raise TypeError("Invalid type for Decimal value: %r", dec)
         unscaled = int(''.join([str(digit) for digit in digits]))
         if sign:
             unscaled *= -1
