From f465123dddb6d9c09ebc2848aec6957ade8b3561 2013-09-16 23:13:01
From: Thomas Kluyver <takowl@gmail.com>
Date: 2013-09-16 23:13:01
Subject: [PATCH] AssertPrints checks for instances of string_types

---

diff --git a/IPython/testing/tools.py b/IPython/testing/tools.py
index a8fc8d5..52fdc58 100644
--- a/IPython/testing/tools.py
+++ b/IPython/testing/tools.py
@@ -18,7 +18,6 @@ from __future__ import absolute_import
 # Imports
 #-----------------------------------------------------------------------------
 
-import inspect
 import os
 import re
 import sys
@@ -346,7 +345,7 @@ class AssertPrints(object):
     """
     def __init__(self, s, channel='stdout', suppress=True):
         self.s = s
-        if isinstance(self.s, str):
+        if isinstance(self.s, py3compat.string_types):
             self.s = [self.s]
         self.channel = channel
         self.suppress = suppress