Burmese pythons, one of the largest snakes in the world, are best known for the way they catch and eat their food. The snake uses its sharp rearward-pointing teeth to seize prey, and then coils its ...

It seems that recent versions of Python have broken some of the material in this course. I'm not motivated to update it so the course is being archived and retired. Thanks for your support over the ...

The database is created automatically on first launch. It is not shipped with the app. ├── main.py # Entry point and page navigation ├── database.py # SQLite access and validation ├── home.py # Home ...

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原因拆解：多半是当前 Python 解释器和 pip 指向的不是同一个环境。 这种情况在系统自带 Python 和虚拟环境共存时尤其常见， pip install 装进了虚拟环境，而运行脚本用的是系统解释器。 也可能是 Linux 环境下 Tkinter 本身缺失，导致 tkcalendar 即使装上了也无法完成导入。

tkcalendar 的安装不复杂，用 pip 直接装就行。 需要注意的一点是它对 Python 和 Tkinter 的版本要求，tkcalendar 需要 Tkinter 环境正常工作，如果在无界面的服务器上装， tkinter 导入会直接报错。 常见做法是先验证当前环境能不能跑 Tkinter，再装 tkcalendar： ...