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Thus far, for us it's been testing individual functions. Later in the term we'll talk about unit testing of classes.
至今为止，我们用到单元测试的地方,就是测试每个单独的方法,在后面我们会讲到类的单元测试。
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It's got this funky looking form, right, it says, I've got something that I'm going to call a class, got that key word class right here.
以及我们怎么来使用这些方法，因此我要回到类这个概念上来，让我们来建立第一个类吧,就在你们课堂手册的这儿，我会去定义一个类。
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Well, one way you can get it is by mixing the gene with lipids, with lipid molecules.
一种方法可以将基因与脂质体混合,同脂类分子混合
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This is the kind of thing you should be able to deduce.
你们必须掌握推导这类问题的方法
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We have historically developed regulations that deal with these problems.
有关机构已经制定了,处理这类问题的监管方法
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When I try and evaluate that expression of greater than, is going to go into the class to say greater than is a comp method.
这个大于的操作符的时候,是到类的定义里去识别，大于是一个比较的方法,那么让我在这里说仔细一点吧。
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Notice the form of it, it's just the name of the class followed by open paren, close paren, treating it like a function.
我该怎么来使用类呢？,好，我可以像调用方法,一样调用类，你可以在下面看到，创建一个名为。
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Some of which I built: cmp, init, str. And there, notice, are the internal definitions And in fact I should've said, we often call those things fields.
就是给我一个所有东西的列表：,所有的方法，与这个类关联的，有一些是我写的：,还有这里，请注意，是一些内部的定义。
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They are instances of a class, and associated with that class is a set of methods.
它们是同一个类的实例，与这个类相关联的是一个方法集,因此例如，我可以说。
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So you can actually say, how do I know which methods are associated with the class? For that, we can call dir. And what it does, is it gives me back a listing of all the things, dir all the methods, that are associated with it.
我们开始建立类了，我们得到了这些方法,因此实际上你可以说，我怎么知道，哪些方法是关联与这些类的？,为了解决这个问题，我们可以调用，这个方法的作用。
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These are instances of a class, and associated with that class are a set of methods things that I can deal with.
但是Python的基本思想是相同的，这是一些一个类的实例,这个类关联了一个方法集,我可以做的一些操作。
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x and get the values of x and y attached to this thing and return them to me.
和y值然后把它们返回给我，It’s，going，to，go，off,这就是我想要的东西,我想要我的类里面有一些方法。
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A newer version of this that works in a similar way but a different way is called RNA interference, and it turns out that this is a natural mechanism that cells have.
NA干扰是这类方法的新秀,它的原理与其大同小异,已经证实 这是细胞的自然机制
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