In addition, you must use the correct programming idiom to check if the collector has reclaimed the object before using it, and if it has, you must re-create the object first.

另外，您必须使用正确的编程风格以检查收集器在使用对象之前是否已经回收了它，如果已经回收了，您首先必须重新创建该对象。

youdao

Those nine hours are going to be primarily working on problem sets, and all the problems sets are going to involve programming in Python, which is the language we're going to be using this term Now, one of the things you're going to see is the first problem sets are pretty easy.

这九个小时会是问题,提出的基本锻炼，所有的问题提出,都将涵盖，我们这学期,将使用的Python语言的程序,现在，你们将要看见的,第一个问题的提出非常简单。

麻省理工公开课 - 计算机科学及编程导论课程节选