def __init__(self, *args, **kwargs):
        super(TabBlockForm, self).__init__(*args, **kwargs)
        instance = kwargs['instance']
        if instance:
            for tab in instance.tabs.all():
                field_name = tab.id % "tab_title_%d"
                self.fields[field_name] = forms.CharField()
                self.fields[field_name].initial = tab.title
                self.fields[field_name].label = _("Tab title")
dataset/ETHPy150Open tangentlabs/django-fancypages/fancypages/dashboard/forms.py/TabBlockForm.__init__/swapped operands of `%`