Apply 2to3 converter to views.

views/graphs/index.pdf

 {{
-    import cStringIO
-    response.body = cStringIO.StringIO()
+    import io
+    response.body = io.StringIO()
 
     response.headers['Content-Type']='application/pdf'
     response.write(data, escape=False)

views/graphs/index.png

 {{
-    import cStringIO
-    response.body = cStringIO.StringIO()
+    import io
+    response.body = io.StringIO()
 
     response.headers['Content-Type']='application/png'
     response.write(data, escape=False)

views/lists/index.odt

 {{include 'lists/index.html'}}
 {{
     import base64
-    import cStringIO
+    import io
     import os
 
 
@@ -63,7 +63,7 @@
     #
     # build the response
     #
-    response.body = cStringIO.StringIO()
+    response.body = io.StringIO()
 
     response.headers['Content-Type']='application/vnd.oasis.opendocument.text'
     response.headers['Content-Disposition'] = 'attachment;filename="list.odt"'

views/tex2pdf.html

@@ -5,7 +5,7 @@
     #
     #--------------------------------------------------------------------------
     import base64
-    import cStringIO
+    import io
     import os
 
     from subprocess import call, check_output
@@ -58,7 +58,7 @@
     # Prepare the response
     #
     response.headers['Content-Type']='application/pdf'
-    response.body = cStringIO.StringIO()
+    response.body = io.StringIO()
 
     s64 = base64.b64encode(spdf)
     response.write(s64, escape=False)