オブジェクト指向で、データモデルを生成するクラスにはどんな名前をつけるべき？
オブジェクト指向の初学者です。データモデル？を生成するクラスの命名に困っています。 以下のような、モデルの生成・編集・削除などをするクラスのことはオブジェクト指向ではなんと呼ぶのでしょうか？また、こうしたオブジェクト指向のクラスの責任の分け方を学ぶためには何を参照するのがよいでしょうか。 # このクラスが"データモデル"です。 Class User(): self.name = "" self.age = 0 # このクラスの命名に悩んでいます。 Class UserFromDatabase(): self.db = DBClient() def make_user(): data = self.db.create({table: "user"}) return User(data) def get_user(id): data = self.db.get({table: "user",
How can I use the fields_to_export attribute in BaseItemExporter to order my Scrapy CSV data?
I have made a simple Scrapy spider that I use from the command line to export my data into the CSV format, but the order of the data seem random. How can I order the CSV fields in my output? I use the following command line to get CSV data: scrapy crawl somwehere -o items.csv -t csv According to this Scrapy documentation, I should be able to use the fields_to_export attribute of the BaseItemExport
Type annotation for classmethod returning instance
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How can I use functools.singledispatch with instance methods?
Python 3.4 added the ability to define function overloading with static methods. This is essentially the example from the documentation: from functools import singledispatch class TestClass(object): @singledispatch def test_method(arg, verbose=False): if verbose: print("Let me just say,", end=" ") print(arg) @test_method.register(int) def _(arg): print("Strength in numbers, eh?", end=" ") print(ar
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