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And in the process of tidying it up and making it prettier, I'll often by accident find the bug.
让我的程序更漂亮些,在这个清理美化代码的过程中，我常常无意中发现我的错误。
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so nobody will notice those horrible continuity mistakes
因此，没有人会发现那些可怕的连贯性错误，
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And, that's a good thing to know because if you come out with an answer that's somewhere near the diameter of the universe and it's supposed to be the diameter of an atom, then you will know that you probably made a mistake.
这是我们需要知道的,因为当你做一道题得到的答案,是宇宙的直径,而正确答案是原子直径时，你能很快发现你的错误。
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I did not want to make a list, I wanted to create a tuple thank you for catching it. I want parens not square brackets there.
为什么这里有错误了，我并不想要创建,一个列表，我想创建一个元组，谢谢你,发现了这个错误。
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And we also realize that The Acts of the Apostles is mistitled.
我们还发现使徒行传的标题是错误的。
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Piaget also discovered that older children fail at a task that's known as the A-not-B task.
皮亚杰还发现,稍大的婴儿无法完成,A非B错误任务
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That'll catch a lot of just silly mistakes for you if you go back and see it and you don't have all of that.
这可以让你抓到很多低级错误,如果你回去发现它们不一样的话。
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But if my students can catch me making a mistake, it means they are following it and they are not hesitating to tell me.
如果我的学生能发现我犯的错误,这证明你们确实在听课,并且愿意直言不讳
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I should warn you again that I'm very likely to make mistakes when I'm doing this kind of thing, so please catch me I do.
我还得提醒一下大家,我总算错,如果发现错误请马上指出
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hey'd rather single step it through using Idol or something, than just read it and try and figure things out. The most important thing to remember when you're doing all of this is to be systematic.
比起阅读代码发现错误来他们,宁愿用内置的操作层,或者其他工具一步完成,你要记住的最重要的事情,就是要系统化的去做调试。
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The problems are set up so that, if you start down the right path, it should be pretty straight-forward to work it through If you start down a plausible but incorrect path, you can sometimes find yourself stuck in the weeds somewhere, and we want to bring you back in.
问题提出了，如果你从，一开始就走正确的道路，解决的途径,就一目了然了,如果你走上一条貌似正确但实际错误的道路，你会在某时某刻,发现自己陷入泥沼，于是我们就会把你拉回来。
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I spotted an error here, I could have spotted it by running it on different test sets, and using prints things, another way of doing it, but this idea of at least simulating it on simple examples lets you check a couple of important questions.
操作么？我在这里发现了一个错误,我也可以通过运行不同的测试集，或者运用print声明来发现这个错误，但是至少应该用简单的例子来手工模拟下,代码的思想可以让你,对一些很重要的问题进行检验。
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All right. What do you do when you've found the bug and you need to fix it?
好了，当你发现错误并修改它们的时候,你该怎么做？记住一个古老的法则？
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cmp My handout's wrong, which I discovered this morning after I printed them all out.
还有，我的课堂手册有错误,我上午打印完才发现有错误。
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It happens. Fortunately, while sitting in jail awaiting trial, the slow thief decided to figure what was wrong. And, amazingly enough, he had studied mathematics. And had a blackboard in the cell. So he was able to work it out.
失主叫了警察然后小偷最后被抓进了监狱,幸运的是这个贼做来牢房里,等待判决时发现了自己的错误,它很惊人的学习过数学，牢房里,还有一个黑板，它可以把题目算出来了。
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Yes. The point is, it's not going to work, and she caught both of them, impressive, it's not going to work because iters left is already negative, it's just going to skip the whole loop, and I'm in trouble, so thank you for catching that.
是的，重点是，程序不会运行的，她发现了两个错误，很令人敬佩，程序不会运行,因为iters，left已经是负数了，它会跳过整个循环，然后就有麻烦了，谢谢你提出这个问题。
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