@file.setter
    def file(self, file_manager):
        self._file = file_manager
10% discount for each LineItem with 20 or more units
dataset/ETHPy150Open OpenCobolIDE/OpenCobolIDE/open_cobol_ide/extlibs/pyqode/core/api/code_edit.py/CodeEdit.file--crossover with--dataset/ETHPy150Open fluentpython/example-code/06-dp-1class-func/strategy_best.py/bulk_item_promo