1 files changed, 19 insertions, 0 deletions
diff --git a/boto/dynamodb/exceptions.py b/boto/dynamodb/exceptions.py
index ef485042..b60d5aa0 100644
--- a/boto/dynamodb/exceptions.py
+++ b/boto/dynamodb/exceptions.py
@@ -2,6 +2,7 @@
 Exceptions that are specific to the dynamodb module.
 """
 from boto.exception import BotoServerError, BotoClientError
+from boto.exception import DynamoDBResponseError
 
 class DynamoDBExpiredTokenError(BotoServerError):
     """
@@ -10,6 +11,7 @@ class DynamoDBExpiredTokenError(BotoServerError):
     """
     pass
 
+
 class DynamoDBKeyNotFoundError(BotoClientError):
     """
     Raised when attempting to retrieve or interact with an item whose key
@@ -17,6 +19,7 @@ class DynamoDBKeyNotFoundError(BotoClientError):
     """
     pass
 
+
 class DynamoDBItemError(BotoClientError):
     """
     Raised when invalid parameters are passed when creating a
@@ -24,3 +27,19 @@ class DynamoDBItemError(BotoClientError):
     """
     pass
 
+
+class DynamoDBConditionalCheckFailedError(DynamoDBResponseError):
+    """
+    Raised when a ConditionalCheckFailedException response is received.
+    This happens when a conditional check, expressed via the expected_value
+    paramenter, fails.
+    """
+    pass
+
+class DynamoDBValidationError(DynamoDBResponseError):
+    """
+    Raised when a ValidationException response is received. This happens
+    when one or more required parameter values are missing, or if the item
+    has exceeded the 64Kb size limit.
+    """
+    pass