Handle configparser.InterpolationSyntaxError Under Python 3, an option value with a single % (e.g. this % is a test) throws configparser.InterpolationSyntaxError: '%' must be followed by '%' or '(', found: '%s))' Added code to capture this, raise a different exception. roundup-admin handles the error and exits cleanly. Other code shows the traceback. The new error message reports the file, section and option causing the problem to allow easier repair. Also updated roundup translations and added tests.