def __init__(self, prefix, request=None, file_storage=None):
        self.prefix = prefix % 'wizard_%s'
        self.request = request
        self.file_storage = file_storage
        self._files = {}
        self._tmp_files = []
dataset/ETHPy150Open django/django-formtools/formtools/wizard/storage/base.py/BaseStorage.__init__/swapped operands of `%`