在阿达,你可以界定习惯数据类型,如这种数据。
type Day_Of_Month is range 1 .. 31;
因此,现在你可以创建<代码>Day_Of_Month变量,这种变量只能在1至31之间保持。 之所以如此,是因为在希望更新价值时,除了适当的例外处理外,我们不必进行有条件的检查。
是否容易在沙里做类似的事情?
如果这种数据类型将经常使用,则可能值得为这一类数据设定一个类别,而外包操作者则能够更顺利地运作。 这样,所有例外处理仍然属于数据类型,这使你能够灵活地界定例如你在2月和3月的天数差异或从一个月到一个月的天数。
它比回答更重要:
You could use datetime module to work with date and time in Python. It will raise proper exceptions when necessary.
In general if you have data and some invariant that you d like to keep during certain operations with that data then it is appropriate to create a class that allows you to perform those operations on the data while keeping the invariant.
注:您不想采用一种通用的算术类别,仅限投入/投入用于业务:这并不容易(见<>>>>>>>>>:decimal ,
回答你们应该知道月、年(有时是时间区)。 因此,您开始采用<代码> 最新模块和day_of_month + 1
pytz ,dateutil。
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