Let us go back to the "Revolt on the Amistad" print we told about at the beginning of this story.

VOA: special.2009.09.02

In there, I want to make this distinction, this nuance: the evaluator is still going to be taking those expressions and using its rules to get a value, but it's not going to print them back out.

在这里，我想要做这么一个，细微差别：运算器依然会,对表达式,进行求值，但是不会,显示结果值。

麻省理工公开课 - 计算机科学及编程导论课程节选

But if it is not, it's going to print out a message here saying, you screwed up, somewhat politely, and it's going to go back around. So it'll just cycle until I get something of the right type.

但是输入不是浮点数的话,我这里就会显示一个消息说，你搞砸了，该稍微有点礼貌吧？,然后我们继续执行循环,一直到得到正确类型的输入。

麻省理工公开课 - 计算机科学及编程导论课程节选

It's using its set of rules to deduce the value and print them back out.

计算器用自己的规则,去计算出结果来并返回。

麻省理工公开课 - 计算机科学及编程导论课程节选

I have a sequence of commands; I've got an assignment statement, I've got another assignment statement, I've got a print statement, I've got an input statement, which we'll come back to in a second.

这是一系列的命令;,我有了一个赋值声明，然后是另外一个赋值声明，还有一个print声明，然后是一个input声明，我们稍后会讲讲这个生命。

麻省理工公开课 - 计算机科学及编程导论课程节选

That's the Python saying, that is a command, that is a specific command to get the value of the expression and print it back out.

这代表着Python告诉我们这是一个命令，这是一个,得到表达式的值,并显示的特殊命令。

麻省理工公开课 - 计算机科学及编程导论课程节选