知行编程网知行编程网  2022-05-14 07:00 知行编程网 |  隐藏边栏 |   抢沙发 |  145 
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Python作为胶水语言，真的是无所不能。这不，最近又出现一个基于 Python3，目标是替代 JavaScript 的前端开发工具 — Brython

好用吗？咱今天来试试用它写一个计算器：

Python 竟然也可以写网页前端了！


不过，我们首先要知道它作为 Python 的客户端 Web 编程工具，和 JS 有什么区别呢？

1. 特点

1. 可轻易地在页面中内嵌 Python 终端进行测试

Python 竟然也可以写网页前端了！

2. 运行速度接近于 CPyhon

3. 写法方便，社区强大，可进行敏捷开发

如果 Python 和 JS 你都写过，那大概率会觉得相同的功能，用 Python 写起来比 JS 更方便。

4.和 JS 一样，你不用安装任何东西就可以开始编写

下面就用Brython做一些简单的实验吧。

2. 实验

0. 安装

与通常的 Python 库一样，可以通过 pip install brython 进行安装。

然后在一个空目录下执行：

1. 在页面上显示 Hello !：


将这份代码保存为index.html，双击在浏览器中打开，即可看到Hello !字样：

Python 竟然也可以写网页前端了！

原理：

代码的 head 中，引入了一个 Brython 引擎附带的 brython.min.js 模块，用于使用 Python 控制页面。

而在 <script type="text/python"> 和 </script> 之间就是相应的 Python 代码。

可以看到，想在 document 中显示文本，只需要直接输入：

后续你将会看到用 Brython 使用标准化的 DOM 语法和页面交互的例子。

2. 用 HTML 标签来做文本格式化：

如果要加粗文本：

部分加粗、部分不加粗：

i 标签：
超链接：
以上例子如下：
效果：

Python 竟然也可以写网页前端了！


3. 写一个简单的计算器

先写好简单的图形架构，用th和tr标签即可：

Python 竟然也可以写网页前端了！


Python 竟然也可以写网页前端了！

然后加上一些 CSS 样式就可以把这个简单的图形架构变漂亮了：

Python 竟然也可以写网页前端了！

最后只需要做运算符的事件触发器即可，从下面这行代码：

可以看出，所有的按钮都被创建为 td 标签，因此我们要获得所有这些按钮是否被点击，仅需要：
意思是，按钮被点击后便执行 action 操作，action 操作定义如下：

Python 竟然也可以写网页前端了！

如果不是 = 号或 C 号，则进行 字符串拼接。

如果是 C 号，则清空 result。

如果是 = 号，则需要计算出结果，直接对字符串用 eval() 函数 即可完成目的。

这边是全部核心代码了，写起来真的极其方便。

你可以访问如下地址体验这个 Python 写的计算器：

https://pythondict.com/calculator.html

完整源码：
https://pan.baidu.com/s/1d4ndpN1Lpzb6fpgqKJ7acQ 

提取码：v36f


作者：Ckend 

来源：Python实用宝典



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<pre style="letter-spacing: 0.544px;line-height: inherit;"><section data-mpa-template="t" mpa-from-tpl="t"><section data-id="94086" data-color="#276ca3" data-tools="135编辑器" mpa-from-tpl="t"><section><section mpa-from-tpl="t"><pre style="color: rgb(63, 63, 63);letter-spacing: 0.544px;line-height: inherit;"><section data-mpa-template="t" mpa-from-tpl="t"><section data-id="94086" data-color="#276ca3" data-tools="135编辑器" mpa-from-tpl="t"><section style="text-align: left;"><section mpa-from-tpl="t" style="display: inline-block;"><pre style="letter-spacing: 0.544px;line-height: inherit;"><pre data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-style="letter-spacing: 0.544px; background-color: rgb(255, 255, 255); text-align: center; color: rgba(230, 230, 230, 0.9); font-size: 16px; line-height: 25.6px; overflow-wrap: break-word !important;" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" 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data-darkmode-original-color-15900529136199="rgb(0, 0, 0)" data-darkmode-bgimage-15900529136199="1" style="margin-left: 2px;caret-color: rgb(255, 0, 0);width: 20px;"></section><section data-brushtype="text" data-darkmode-bgcolor-15860613985508="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15860613985508="rgb(255, 255, 255)" data-darkmode-color-15860613985508="rgb(51, 51, 51)" data-darkmode-original-color-15860613985508="rgb(51, 51, 51)" data-darkmode-bgimage-15860613985508="1" data-darkmode-bgcolor-15870356070738="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356070738="rgb(255, 255, 255)" data-darkmode-color-15870356070738="rgb(51, 51, 51)" data-darkmode-original-color-15870356070738="rgb(51, 51, 51)" data-darkmode-bgimage-15870356070738="1" data-darkmode-bgcolor-15870356071023="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15870356071023="rgb(255, 255, 255)" data-darkmode-color-15870356071023="rgb(51, 51, 51)" data-darkmode-original-color-15870356071023="rgb(51, 51, 51)" data-darkmode-bgimage-15870356071023="1" data-darkmode-bgcolor-15882384789136="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882384789136="rgb(255, 255, 255)" data-darkmode-color-15882384789136="rgb(51, 51, 51)" data-darkmode-original-color-15882384789136="rgb(51, 51, 51)" data-darkmode-bgimage-15882384789136="1" data-darkmode-bgcolor-15882396318564="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15882396318564="rgb(255, 255, 255)" data-darkmode-color-15882396318564="rgb(51, 51, 51)" data-darkmode-original-color-15882396318564="rgb(51, 51, 51)" data-darkmode-bgimage-15882396318564="1" data-darkmode-bgcolor-15900529136199="rgb(36, 36, 36)" data-darkmode-original-bgcolor-15900529136199="rgb(255, 255, 255)" data-darkmode-color-15900529136199="rgb(51, 51, 51)" data-darkmode-original-color-15900529136199="rgb(51, 51, 51)" data-darkmode-bgimage-15900529136199="1" style="caret-color: rgb(255, 0, 0);font-size: 14px;color: rgb(51, 51, 51);text-align: left;"><span style="font-family: 楷体, 楷体_GB2312, SimKai;font-size: 15px;">点这里，进菜鸟学PythonB站大本营</span><span style="font-family: mp-quote, -apple-system-font, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", Arial, sans-serif;letter-spacing: 0.544px;font-size: 17px;text-align: justify;"></span></section></section></section></section></section></section></section>

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