Re #25: Use compatibility layer to get the right StringIO.

Depending on the python version, the traceback handler in the standard library needs a different `StringIO`. `io.StringIO` does not work with Python 2.
zopefoundation · Oct 2, 2018 · ca0ab5c · ca0ab5c
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diff --git a/CHANGES.rst b/CHANGES.rst
@@ -4,6 +4,7 @@ Changelog
 3.0b5 (unreleased)
 ------------------
 
+- Fix regression with exception handling in ``<dtml-except>`` with Python 2.
 - Stabilized TreeTag rendering for objects without ``_p_oid`` values.
 
 

diff --git a/src/DocumentTemplate/DT_Try.py b/src/DocumentTemplate/DT_Try.py
@@ -14,7 +14,7 @@
 import sys
 import traceback
 
-from io import StringIO
+from six import StringIO
 from DocumentTemplate.DT_Util import ParseError, parse_params, render_blocks
 from DocumentTemplate.DT_Util import namespace, InstanceDict
 from DocumentTemplate.DT_Return import DTReturn