Python解释器及IDLE的使用
- Python解释器
想必大家都已经了解到Python是一种解释型语言，当我们装载了Python解释器之后，解释器会读取我们编写的程序并执行，我们会采用两种形式去使用解释器，他们分别是交互模式和文件模式。
- 交互模式
交互模式指的是我们在终端进入Python或者在IDLE中输入一行代码执行一次的模式，在后面的学习中，部分例题会采用交互模式。
以我们刚装载好的IDLE为例来介绍一下交互模式，首先我们找到我们的Python解释器，在当前页面可以直接进行交互。
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注：以交互模式运行时通常被称为Python shell
我们可以看到‘>>>’这个符号，我们可以在他后面进行输入指令，首先我们来输入一条简单的指令看一下效果。
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第一行为我们输入的信息，回车（enter）之后会看到第二行的信息，也就是解释器打印出的内容。(我们在一次交互模式下定义过的变量等都是可以重复使用的)
然后‘>>>’再次出现等待我们的第二次指令的发送。
下面再展示几个实例，此时你也可以打开你的解释器进行练习。
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在交互模式下如果出现错误代码系统会立刻报错。
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交互模式在我们学习新内容的时候可以得到及时的调试并得到反馈。
2) 文件模式
尽管交互模式在调试的时候使用着很方便，但却不利于保存，它只是简单的执行并显示在屏幕上，我们在需要编写之后并保存下来就要采用文件模式。
我们可以创建一个文本文件并以.py结尾然后使用IDLE打开，或者在IDLE中直接点击File->New File进入一个文件，然后可以进行代码的编写。
先编写一段入门代码：
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通过F5或者在Run中run Module执行文件。
运行结果如下：
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3) 文件模式下进行交互
文件模式下是先编写程序然后运行到shell页面
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然后我们运行它来进行交互
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在交互的过程中，如果我们的主程序，也就是test.py是没有错误的，就可
以在交互页面一直进行操作，哪怕是语法错误也仍在当前文件下。但是如果我们主 程序（test.py）出 现了语法错误，那么出现错误的语句下面的语句都不会被执行。
我们来看个例子：
代码如下：
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我们来研究分析一下当中间有一步为错误之后，后续语句是否会被处理。
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- 总结
通过这些例子想必大家可以认识到交互模式、文件模式、以及文件模式下使用Python shell进行交互，在程序出错的时候是处于一个什么样的状态，在学习过程中，推荐大家采用第二种方式去进行学习开发。
下一节我们来介绍一款Python学习过程中最常用到的开发工具——Pycharm。
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