Fix non-ASCII supplement info under Python 2 and drop Py3.3.issue1

Fixes #1.

Fix the coverage environment using zope.testrunner (nose no longer
works, that same namespace path issue).

Also run the doctests on all supported versions. This requires
dropping Python 3.3 because sphinx needs 3.4+.

1 files changed, 3 insertions, 5 deletions

diff --git a/src/zope/exceptions/log.py b/src/zope/exceptions/log.py
index 735429a..574ccd3 100644
--- a/src/zope/exceptions/log.py
+++ b/src/zope/exceptions/log.py
@@ -15,13 +15,11 @@
 """
 
 import logging
-try:
-    from StringIO import StringIO
-except ImportError: #pragma: no cover Python3
-    from io import StringIO
+import io
 
 from zope.exceptions.exceptionformatter import print_exception
 
+Buffer = io.StringIO if bytes is not str else io.BytesIO
 
 class Formatter(logging.Formatter):
 
@@ -30,7 +28,7 @@ class Formatter(logging.Formatter):
 
         Uses zope.exceptions.exceptionformatter to generate the traceback.
         """
-        sio = StringIO()
+        sio = Buffer()
         print_exception(ei[0], ei[1], ei[2], file=sio, with_filenames=True)
         s = sio.getvalue()
         if s.endswith("\n"):