1 files changed, 11 insertions, 1 deletions
diff --git a/msgpack/exceptions.py b/msgpack/exceptions.py
index 5bee5b2..d6d2615 100644
--- a/msgpack/exceptions.py
+++ b/msgpack/exceptions.py
@@ -6,6 +6,7 @@ class UnpackException(Exception):
     Exception instead.
     """
 
+
 class BufferFull(UnpackException):
     pass
 
@@ -14,6 +15,14 @@ class OutOfData(UnpackException):
     pass
 
 
+class FormatError(ValueError, UnpackException):
+    """Invalid msgpack format"""
+
+
+class StackError(ValueError, UnpackException):
+    """Too nested"""
+
+
 # Deprecated.  Use ValueError instead
 UnpackValueError = ValueError
 
@@ -24,6 +33,7 @@ class ExtraData(UnpackValueError):
     This exception is raised while only one-shot (not streaming)
     unpack.
     """
+
     def __init__(self, unpacked, extra):
         self.unpacked = unpacked
         self.extra = extra
@@ -32,7 +42,7 @@ class ExtraData(UnpackValueError):
         return "unpack(b) received extra data."
 
 
-#Deprecated.  Use Exception instead to catch all exception during packing.
+# Deprecated.  Use Exception instead to catch all exception during packing.
 PackException = Exception
 PackValueError = ValueError
 PackOverflowError = OverflowError