More Python 3 compatibility fixes.

IPython/utils/text.py

@@ -23,7 +23,7 b' import textwrap'
 from string import Formatter
 
 from IPython.external.path import path
-
+from IPython.utils import py3compat
 from IPython.utils.io import nlprint
 from IPython.utils.data import flatten
 
@@ -284,7 +284,7 b' def make_quoted_expr(s):'
     tail = ''
     tailpadding = ''
     raw  = ''
-    ucode = 'u'
+    ucode = '' if py3compat.PY3 else 'u'
     if "\\" in s:
         raw = 'r'
         if s.endswith('\\'):
@@ -494,7 +494,7 b" def marquee(txt='',width=78,mark='*'):"
     """
     if not txt:
         return (mark*width)[:width]
-    nmark = (width-len(txt)-2)/len(mark)/2
+    nmark = (width-len(txt)-2)//len(mark)//2
     if nmark < 0: nmark =0
     marks = mark*nmark
     return '%s %s %s' % (marks,txt,marks)

IPython/utils/traitlets.py

@@ -52,15 +52,17 b' import inspect'
 import re
 import sys
 import types
-from types import (
-    InstanceType, ClassType, FunctionType,
-    ListType, TupleType
-)
-from .importstring import import_item
-
+from types import FunctionType
+try:
+    from types import ClassType, InstanceType
 ClassTypes = (ClassType, type)
+except:
+    ClassTypes = (type,)
 
-SequenceTypes = (ListType, TupleType, set, frozenset)
+from .importstring import import_item
+from IPython.utils import py3compat
+
+SequenceTypes = (list, tuple, set, frozenset)
 
 #-----------------------------------------------------------------------------
 # Basic classes
@@ -108,7 +110,7 b' def repr_type(obj):'
     error messages.
     """
     the_type = type(obj)
-    if the_type is InstanceType:
+    if (not py3compat.PY3) and the_type is InstanceType:
         # Old-style class.
         the_type = obj.__class__
     msg = '%r %r' % (obj, the_type)
@@ -616,7 +618,7 b' class ClassBasedTraitType(TraitType):'
 
     def error(self, obj, value):
         kind = type(value)
-        if kind is InstanceType:
+        if (not py3compat.PY3) and kind is InstanceType:
             msg = 'class %s' % value.__class__.__name__
         else:
             msg = '%s (i.e. %s)' % ( str( kind )[1:-1], repr( value ) )
@@ -880,7 +882,7 b' class CInt(Int):'
         except:
             self.error(obj, value)
 
-
+if not py3compat.PY3:
 class Long(TraitType):
     """A long integer trait."""
 
@@ -955,7 +957,7 b' class CComplex(Complex):'
 # for Python 3 conversion and for reliable unicode behaviour on Python 2. So
 # we don't have a Str type.
 class Bytes(TraitType):
-    """A trait for strings."""
+    """A trait for byte strings."""
 
     default_value = ''
     info_text = 'a string'
@@ -967,7 +969,7 b' class Bytes(TraitType):'
 
 
 class CBytes(Bytes):
-    """A casting version of the string trait."""
+    """A casting version of the byte string trait."""
 
     def validate(self, obj, value):
         try:

IPython/zmq/session.py

@@ -380,7 +380,7 b' class Session(Configurable):'
         h = self.auth.copy()
         for m in msg_list:
             h.update(m)
-        return h.hexdigest()
+        return str_to_bytes(h.hexdigest())
     
     def serialize(self, msg, ident=None):
         """Serialize the message components to bytes.