Remove deprecated exception classes (#323)

msgpack/exceptions.py

@@ -1,6 +1,10 @@
 class UnpackException(Exception):
-    """Deprecated.  Use Exception instead to catch all exception during unpacking."""
+    """Base class for some exceptions raised while unpacking.
 
+    NOTE: unpack may raise exception other than subclass of
+    UnpackException.  If you want to catch all error, catch
+    Exception instead.
+    """
 
 class BufferFull(UnpackException):
     pass
@@ -10,11 +14,16 @@ class OutOfData(UnpackException):
     pass
 
 
-class UnpackValueError(UnpackException, ValueError):
-    """Deprecated.  Use ValueError instead."""
+# Deprecated.  Use ValueError instead
+UnpackValueError = ValueError
 
 
 class ExtraData(UnpackValueError):
+    """ExtraData is raised when there is trailing data.
+
+    This exception is raised while only one-shot (not streaming)
+    unpack.
+    """
     def __init__(self, unpacked, extra):
         self.unpacked = unpacked
         self.extra = extra
@@ -23,19 +32,7 @@ class ExtraData(UnpackValueError):
         return "unpack(b) received extra data."
 
 
-class PackException(Exception):
-    """Deprecated.  Use Exception instead to catch all exception during packing."""
-
-
-class PackValueError(PackException, ValueError):
-    """PackValueError is raised when type of input data is supported but it's value is unsupported.
-
-    Deprecated.  Use ValueError instead.
-    """
-
-
-class PackOverflowError(PackValueError, OverflowError):
-    """PackOverflowError is raised when integer value is out of range of msgpack support [-2**31, 2**32).
-
-    Deprecated.  Use ValueError instead.
-    """
+#Deprecated.  Use Exception instead to catch all exception during packing.
+PackException = Exception
+PackValueError = ValueError
+PackOverflowError = OverflowError