小编tvg*_*iek的帖子

我经常发现自己遇到了同样的问题。一个常见的模式是我创建一个执行某些操作的类。例如。加载数据，转换/清除数据，保存数据。然后出现问题，如何传递/保存中间数据。查看以下2个选项：

import read_csv_as_string, store_data_to_database

class DataManipulator:
    ''' Intermediate data states are saved in self.results'''

    def __init__(self):
        self.results = None

    def load_data(self):
        '''do stuff to load data, set self.results'''
        self.results = read_csv_as_string('some_file.csv')

    def transform(self):
        ''' transforms data, eg get first 10 chars'''
        transformed = self.results[:10]
        self.results = transformed

    def save_data(self):
        ''' stores string to database'''
        store_data_to_database(self.results)

    def run(self):
        self.load_data()
        self.transform()
        self.save_data()

DataManipulator().run()

class DataManipulator2:
    ''' Intermediate data states are not saved but passed along'''


    def load_data(self):
        ''' do stuff to load …