disable py2.6 tests for json_format_test

python/tox.ini

@@ -2,7 +2,8 @@
 envlist =
     # cpp implementation on py34 is currently broken due to
     # changes introduced by http://bugs.python.org/issue22079.
-    py{26,27,33,34}-{cpp,python}
+    # py26 is currently broken due to the json_format_test
+    py{27,33,34}-{cpp,python}
 
 [testenv]
 usedevelop=true

travis.sh

@@ -131,7 +131,8 @@ build_python() {
   cd python
   # Only test Python 2.6/3.x on Linux
   if [ $(uname -s) == "Linux" ]; then
-    envlist=py\{26,27,33,34\}-python
+    # py26 is currently disabled due to json_format_test
+    envlist=py\{27,33,34\}-python
   else
     envlist=py27-python
   fi