The open and close brackets ([and]) mark the beginning and end of the code block, respectively.

开方括号和闭方括号([和])分别标志代码块的开始和结束。

youdao

At the beginning we started with a simple example, but lets revist a simple case where we use eval with the binding of a block.

先让我们从一个简单的例子开始，不过让我们先回顾一下如何根据block的binding使用eval。

youdao

What I'm particularly interested in, though, is the workflow near the beginning of the try block. Notice these two consecutive lines!

但是，我感兴趣的是接近try块开头的工作流。

youdao

The colon is important It's defining the beginning of a block of instructions. Yes sir.

这个冒号很重要,是因为它定义了,一块指令的开始，有问题么？

麻省理工公开课 - 计算机科学及编程导论课程节选

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