The test in roundup/anypy/xmlrpc_.py  is insufficient (cf.
https://github.com/PythonCharmers/python-future/issues/280).

Without a fix, I got the following error when starting the roundup-server:
AttributeError: 'module' object has no attribute 'SimpleXMLRPCDispatcher'

I attached a patch with an (admittedly silly) fix.

FWIW, for configparser module selection I used an explicit 
sys.version_info check to determine which modules to import, when a 
backport of the Python 3 configparser to Python 2 proved to cause problems 
for Roundup.

On further examination:

This case is arguably different from the configparser one, because the 
configparser case was a complete backport, that just did things 
differently from expected in Python 2, whereas this is a case of a module 
name being provided but missing some of the contents but without any 
evidence that an actual complete backport would not work.  So applying 
your patch would seem reasonable to fix this issue (and likewise for 
issue2551011).  Neither issue is present in 1.6 (unlike the configparser 
one); they both arise from Python 3 changes postdating the 1.6 release.

I've now committed this patch.