Given a sequence of (name, abbrev, default) tuples, return a sequence of Widgets.

def widgets_from_abbreviations(self, seq):
        """Given a sequence of (name, abbrev, default) tuples, return a sequence of Widgets."""
        result = []
        for name, abbrev, default in seq:
            widget = self.widget_from_abbrev(abbrev, default)
            if not (isinstance(widget, ValueWidget) or isinstance(widget, fixed)):
                if widget is None:
                    raise ValueError("{!r} cannot be transformed to a widget".format(abbrev))
                else:
                    raise TypeError("{!r} is not a ValueWidget".format(widget))
            if not widget.description:
                widget.description = name
            widget._kwarg = name
            result.append(widget)
        return result