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So you're implementing this black box, and if its purpose in life is to actually return a value, you have to tell the compiler what kind of value to expect, and this is going to have ripple effects.
你在实现这个黑盒子，如果它的目的是,返回一个值，你必须告诉编译器你期望的是什么类型的值，这个将是一个连锁反应。
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Is it one basically? In which case, just return a copy the list. That's the simple case.
是最基本的情况吗？在这种情况下,仅仅返回一个列表的拷贝，这是简单的情况。
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It shows the standard deviation of the return on the portfolio as a function of the expected return on the portfolio.
它是投资组合的收益标准差,关于预期收益率的函数图像。
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I want to flip back to text for a moment before I return to talk about a whole contradictory set of methodologies, or methodologies that pull in another direction. But first I want to get us up to the patriarchs and matriarchs where we're going to be starting off on Monday.
回到谈论一整套相互冲突，截然相反的,研究方法之前，我想跳回到经文部分,首先，我希望你们关注一下宗教创始人的部分,这点我们会在周一开始讨论。
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we now have a return of the division between moderates, optimists and pessimists.
现在我们有了温和主义者，乐观主义者和悲观主义者之分。
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And so what I'm going to do the next day is return to this discussion, and take a look at a more rational view of the chemical world. So, we'll see you on Friday.
我下一次要做的就是,继续这个讨论，并且观察一个更为理性的,关于化学世界的观点，周五见。
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D-A-V-I-D Well, if I've got a five-letter word like D-A-V-I-D, well, that's like five bytes and yet we only have the ability thus far in this class to return one thing at a time I can't return five bytes to you, but wait a minute, those bytes by nature of a computer are just stored in RAM.
好的，如果有5个字母的单词，如，那是5个字节,我们只能返回一个东西,而不能返回5个字节，等一下，这些字节被计算机本能地,存储在内存中。
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If I come into this code, I'm going to check this branch first, if it's not true, ah, there's a return at the end of that branch. If it is true, I do that, and then I've got a second test. If it's true, return I return, otherwise a return.
但是如果我们看看这里,如果我看这段程序,我会先检查这一部分，如果它是假的，啊，这部分分支结尾有一个。
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In particular, I'm going to return a tuple.
特别要注意，我要返回一个数组。
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And then the only other difference is obviously, it's a function I need to return a value.
然后还剩下一点明显的区别，对于方法我要有返回值。
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If it isn't, then I'm going to go back around the loop, and notice what happens. If I get all the way around the loop, that is, all the way through that FOR loop and I never find a path that takes me through here, then the last thing I'm going to do is return a pair or a tuple with a special simple number none twice.
如果没有,我会回到循环看看发生了什么,如果我运行了整个循环,也就是整个for循环,我仍没有找到符合条件的路径,那么我最后做的事情就是返回一对,或者一个数组的两次none值。
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And so it's usually the case that you can get a higher return if you're willing to take more risk.
同样很常见的例子是,所以如果你愿意冒高风险,你可能就会有高回报。
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You can see that by doing this transaction I have locked in a return between 1926 and 1927.
你们可以发现,通过以上交易,我确定了26到27年间的回报
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.. The equity premium is the-- 2.8% this short-term 2.8% is the riskless return, historically, for a period of almost 200 years.
股权溢价就是-,这个短期无风险投资收益率是，是根据近200年的数据得出的。
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You could always find a portfolio that had a higher expected return for the same standard deviation.
你总是可以找到一个投资组合,具有较高的预期回报,而标准差不变。
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Second thing we saw is, that using this as a computation, I can return multiple values.
我们看到的第二件事是把它用作计算,我可以返回多个值。
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