btw, the messages should be marked for translation. Also string
substitutions is preferable, it's better for translators. In this case
core.error(_("Unable to remove space time dataset register table ") + self.get_stds_register())
Use:
core.error(_("Unable to remove space time dataset register table %s") % self.get_stds_register())
Using substitution allows the position of the subject/object to be
changed if that's appropriate for a particular language. Appending
means that it has to come at the end, which can sometimes require
contrived and/or grammatically incorrect translations.
If a string contains more than one substitution, it's better to use
the dictionary form, to allow the order to be changed. Unlike C's
printf(), Python doesn't support the "%1$s" notation.