From 54a171839c9bdf6ea91e29062bc42af9ec93cbbc 2011-09-07 11:17:24
From: Thomas Kluyver <takowl@gmail.com>
Date: 2011-09-07 11:17:24
Subject: [PATCH] More Python 3 compatibility fixes.

---

diff --git a/IPython/utils/text.py b/IPython/utils/text.py
index 9b2070f..0ec91ef 100644
--- a/IPython/utils/text.py
+++ b/IPython/utils/text.py
@@ -23,7 +23,7 @@ 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 @@ 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 @@ 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)
diff --git a/IPython/utils/traitlets.py b/IPython/utils/traitlets.py
index fedc401..1bb7479 100644
--- a/IPython/utils/traitlets.py
+++ b/IPython/utils/traitlets.py
@@ -52,15 +52,17 @@ import inspect
 import re
 import sys
 import types
-from types import (
-    InstanceType, ClassType, FunctionType,
-    ListType, TupleType
-)
+from types import FunctionType
+try:
+    from types import ClassType, InstanceType
+    ClassTypes = (ClassType, type)
+except:
+    ClassTypes = (type,)
+    
 from .importstring import import_item
+from IPython.utils import py3compat
 
-ClassTypes = (ClassType, type)
-
-SequenceTypes = (ListType, TupleType, set, frozenset)
+SequenceTypes = (list, tuple, set, frozenset)
 
 #-----------------------------------------------------------------------------
 # Basic classes
@@ -108,7 +110,7 @@ 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 @@ 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 ) )
@@ -880,29 +882,29 @@ class CInt(Int):
         except:
             self.error(obj, value)
 
+if not py3compat.PY3:
+    class Long(TraitType):
+        """A long integer trait."""
 
-class Long(TraitType):
-    """A long integer trait."""
+        default_value = 0L
+        info_text = 'a long'
 
-    default_value = 0L
-    info_text = 'a long'
-
-    def validate(self, obj, value):
-        if isinstance(value, long):
-            return value
-        if isinstance(value, int):
-            return long(value)
-        self.error(obj, value)
+        def validate(self, obj, value):
+            if isinstance(value, long):
+                return value
+            if isinstance(value, int):
+                return long(value)
+            self.error(obj, value)
 
 
-class CLong(Long):
-    """A casting version of the long integer trait."""
+    class CLong(Long):
+        """A casting version of the long integer trait."""
 
-    def validate(self, obj, value):
-        try:
-            return long(value)
-        except:
-            self.error(obj, value)
+        def validate(self, obj, value):
+            try:
+                return long(value)
+            except:
+                self.error(obj, value)
 
 
 class Float(TraitType):
@@ -955,7 +957,7 @@ 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 @@ 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:
diff --git a/IPython/zmq/session.py b/IPython/zmq/session.py
index 4649685..c02f5cc 100644
--- a/IPython/zmq/session.py
+++ b/IPython/zmq/session.py
@@ -380,7 +380,7 @@ 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.