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class ExportImportMixin:
    def import_data(self, sender_dict):
        try:
            for key in self.EXPORT_IMPORT_ATTRIBUTES:
                getattr(self, key).set(sender_dict[key])
        except ValueError:
            pass
        except (IndexError, KeyError):
            print('Import of view data', self.__class__.__name__, 'failed...')
            return 0

    def export_data(self):
        data_to_export = {}
        try:
            for key in self.EXPORT_IMPORT_ATTRIBUTES:
                data_to_export[key] = getattr(self, key).get()
            return data_to_export
        except ValueError:
            pass
        except (IndexError, KeyError):
            print('Export of view data', self.__class__.__name__, 'failed...')
            return 0


class DataContainer(ExportImportMixin):

    EXPORT_IMPORT_ATTRIBUTES = ['work_directory',
                                'nomenclature',
                                'wheel_type',
                                'rotation_direction',
                                'blade_count_main',
                                'blade_count_splitter']

    def __init__(self, controller):
        self.ctrl = controller

        self.work_directory = tk.StringVar()
        self.nomenclature = tk.StringVar()
        self.wheel_type = tk.StringVar()
        self.rotation_direction = tk.StringVar()
        self.blade_count_main = tk.IntVar()
        self.blade_count_splitter = tk.IntVar()