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一、问题呈现

在初次运行ReactPy报错raise RuntimeError("No built-in server implementation installed.") RuntimeError: No built-in server implementation installed.具体报错信息如下：

D:\install\develop\Anaconda3\envs\py37\Scripts\python.exe D:\Datas\CodeDate\PythonCode\ReactPy-Web-test\src\common\test-web.py 
2023-06-14T09:53:18+0800 | WARNING | The `run()` function is only intended for testing during development! To run in production, consider selecting a supported backend and importing its associated `configure()` function from `reactpy.backend.<package>` where `<package>` is one of ['starlette', 'fastapi', 'sanic', 'tornado', 'flask']. For details refer to the docs on how to run each package.
Traceback (most recent call last):
  File "D:\install\develop\Anaconda3\envs\py37\lib\site-packages\reactpy\backend\default.py", line 59, in _default_implementation
    implementation = next(all_implementations())
StopIteration

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "D:\Datas\CodeDate\PythonCode\ReactPy-Web-test\src\common\test-web.py", line 7, in <module>
    run(hello_world)
  File "D:\install\develop\Anaconda3\envs\py37\lib\site-packages\reactpy\backend\utils.py", line 37, in run
    app = implementation.create_development_app()
  File "D:\install\develop\Anaconda3\envs\py37\lib\site-packages\reactpy\backend\default.py", line 28, in create_development_app
    return _default_implementation().create_development_app()
  File "D:\install\develop\Anaconda3\envs\py37\lib\site-packages\reactpy\backend\default.py", line 62, in _default_implementation
    raise RuntimeError("No built-in server implementation installed.")
RuntimeError: No built-in server implementation installed.

截图如下

二、问题原因及解决办法

去百度并没有找到相关解释，所这里我就记录一下，供后来人参考
针对这个问题，我排查了一点点时间，最后在ReactPy开发官网找到了问题的原因。
先上ReactPy开发官网地址：https://reactpy.dev/docs/guides/getting-started/index.html
在页面中有这样一句话：

大概意思是说，安装ReactPy的同时还需要安装一个支持ReactPy的服务器–这里推荐starlette，安装命令如下：

pip install "reactpy[starlette]"

ps：
报错的原因就是我直接只安装了ReactPy，而没有安装服务器，为此出现了问题，所以大家这里记得一定要用这个命令进行安装：pip install "reactpy[starlette]"。

三、处理结果

然后在运行就可以成功啦，成功相关截图如下：