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You can override the MultiWidget’s format_output method:
def format_output(self, rendered_widgets):
return u'%s - %s - %s' % \
(rendered_widgets[0], rendered_widgets[1], rendered_widgets[2])
There isn’t a ton of documentation on custom form widgets. I’ve only made a couple, and they took a lot of tinkering. Hope that helps!
Source:stackexchange.com