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# 使用 [pythontutor.com](https://pythontutor.com/) 可视化的执行流程
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由于网站都是英文的,所以接下来我会一步步的截图,请按照顺序执行
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## 1. 选择编程语言
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## 2. 在输入框中粘贴代码
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```py
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n=1
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i=0
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while i<5:
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i=i+1
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n=n*2
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print(n)
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```
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## 3. 点击【可视化执行】按钮
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## 4. 进入调试页面
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① 绿色箭头表示【当前正在】执行的语句
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② 红色箭头表示【接下来要】执行的语句
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③ 输出结果
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④ 显示变量的值
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## 5. 基础调试
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5.1 不断点击 ①【Next 下一步】按钮
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5.2 代码左侧 ② 出现绿色和红色箭头,指向【当前】和【接下来】的执行语句。
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5.3 右侧 ③ 实时展示变量的值
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**注意观察箭头的走向和变量值的变化**
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## 6. 拖动进度条 *
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可以拖动进度条反复查看,或者点击【First】跳到第一步,【Last】直接跳到最后一步
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## 7. 更改代码再次调试
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点击【Edit this code】按钮可以修改代码
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**可以更改 i 的初始值 i=?,条件符号,条件值,计数器 i=i+? 等**
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比如:
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遇到弹框,直接点按钮
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