def __init__(self, *args, **kwargs):
        extra = kwargs.pop('extra')
        super(PageEditFileContextForm, self).__init__(*args, **kwargs)

        for f, c in extra.items():
            self.fields[f % '%s'] = forms.CharField(initial=c)
dataset/ETHPy150Open zorna/zorna/zorna/pages/forms.py/PageEditFileContextForm.__init__/swapped operands of `%`