feat: add flask.md cheatsheet (#222)
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		@@ -24,6 +24,7 @@ Quick Reference
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[C#](./docs/cs.md)<!--rehype:style=background: rgb(6 147 13);&class=contributing-->  
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[Django](./docs/djiango.md)<!--rehype:style=background: rgb(12 75 51);&class=contributing tag&data-lang=Python-->  
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[FFmpeg](./docs/ffmpeg.md)<!--rehype:style=background: rgb(0 193 9);&class=contributing-->  
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[Flask](./docs/flask.md)<!--rehype:style=background: rgb(210 168 255);&class=contributing tag&data-lang=Python-->
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[Flutter](./docs/flutter.md)<!--rehype:style=background: rgb(150 220 254);&class=contributing tag&data-lang=Dart-->  
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[Gitlab CI/CD](./docs/gitlab-ci.md)<!--rehype:style=background: rgb(226 67 41);&class=contributing-->  
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[LaTeX](./docs/latex.md)<!--rehype:style=background: rgb(0 128 128);&class=contributing-->  
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@@ -44,7 +45,8 @@ Quick Reference
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[Dart](./docs/dart.md)<!--rehype:style=background: rgb(64 196 255);-->  
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[Docker](./docs/docker.md)<!--rehype:style=background: rgb(72 143 223);-->  
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[Dockerfile](./docs/dockerfile.md)<!--rehype:style=background: rgb(0 72 153);&class=tag&data-lang=Docker-->  
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[Django](./docs/djiango.md)<!--rehype:style=background: rgb(12 75 51);&class=contributing tag&data-lang=Python-->  
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[Django](./docs/djiango.md)<!--rehype:style=background: rgb(12 75 51);&class=contributing tag&data-lang=Python--> 
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[Flask](./docs/flask.md)<!--rehype:style=background: rgb(210 168 255);&class=contributing tag&data-lang=Python--> 
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[Flutter](./docs/flutter.md)<!--rehype:style=background: rgb(150 220 254);&class=contributing tag&data-lang=Dart-->  
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[Golang](./docs/golang.md)<!--rehype:style=background: rgb(39 160 193);-->  
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[GraphQL](./docs/graphql.md)<!--rehype:style=background: rgb(214 66 146);-->  
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@@ -395,7 +397,7 @@ Quick Reference
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[cms.im](https://quickref.cms.im/)<!--rehype:target=_blank-->
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[nuomiphp.com](https://reference.tool.nuomiphp.com/)<!--rehype:target=_blank-->
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[eryajf.net](https://ref.eryajf.net/)<!--rehype:target=_blank&class=contributing&data-info=👆每天自动同步-->
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[kjchmc.cn](https://ref.kjchmc.cn/)<!--rehype:target=_blank&class=contributing&data-info=👆实时同步,自动切换国内外节点-->
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[kjchmc.cn](https://ref.kjchmc.cn/)<!--rehype:target=_blank&class=contributing&data-info=👆实时同步,多线路-->
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<!--rehype:class=home-card home-links-->
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如果你有资源,可以很方便部署 web 版,这非常简单,只需要克隆 [gh-pages](https://github.com/jaywcjlove/reference/tree/gh-pages) 分支代码到你的静态服务就可以了,还可以使用 [docker](https://hub.docker.com/r/wcjiang/reference) 快捷部署 web 版。
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Flask 备忘清单
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===
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本清单对 Flask 的入门进行了简要的概述,以及其常用示例。需要有 `HTML` 和 `Python` 基础。
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入门
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-----
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### 相关链接
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- [HTML](https://developer.mozilla.org/en-US/docs/Web/HTML) _(developer.mozilla.org)_
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- [Python](https://www.python.org/) _(python.org)_
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- [Flask](https://flask.palletsprojects.com/) _(flask.palletsprojects.com)_
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- [Python 备忘清单](./python.md) _(kjchmc.cn)_
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### Hello World
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#### hello.py
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```python
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# 导入 Flask 类
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from flask import Flask
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# 创建应用实例
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app = Flask(__name__)     # 'Flask' 参数是 应用程序模块 或 包 的名称
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                          # __name__是适用于大多数情况的便捷快捷方式
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# 路由 (装饰器)
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@app.route('/')           # route()装饰器告诉 Flask 什么路径触发下面的功能
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def hello():
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   return 'Hello World!'  # 该函数返回我们想要在浏览器中显示的消息内容
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                          # 默认类型 HTML, 因此字符串中的 HTML 将被浏览器渲染
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# 启动服务
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if __name__ == '__main__':
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   app.run()
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```
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### 运行 `hello.py` 程序
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```shell
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$ python hello.py
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 * Serving Flask app 'hello'
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 * Running on http://127.0.0.1:5000
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 * Press CTRL+C to quit
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```
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#### 或
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```shell
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$ flask --app hello run
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 * Serving Flask app 'hello'
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 * Running on http://127.0.0.1:5000
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 * Press CTRL+C to quit
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```
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