core: PythonCodeUtils python3

product/ERP5/bootstrap/erp5_core/ExtensionTemplateItem/portal_components/extension.erp5.PythonCodeUtils.py

-from six import string_types as basestring
 import re
+import six
 import json
 import sys
 from zExceptions import ExceptionFormatter
@@ -15,7 +15,7 @@ def checkPythonSourceCodeAsJSON(self, data, REQUEST=None):
   """
 
   # XXX data is encoded as json, because jQuery serialize lists as []
-  if isinstance(data, basestring):
+  if isinstance(data, six.string_types):
     data = json.loads(data)
 
   # data contains the code, the bound names and the script params. From this
@@ -49,8 +49,10 @@ def checkPythonSourceCodeAsJSON(self, data, REQUEST=None):
   else:
     body = data['code']
 
+  if six.PY2:
+    body = body.encode('utf8')
   try:
-    message_list = checkPythonSourceCode(body.encode('utf8'), data.get('portal_type'))
+    message_list = checkPythonSourceCode(body, data.get('portal_type'))
   except Exception:
     message_list = [{
       'type': 'E',