os.path.join (folder, filename) ensures the path is correct for the system. On Windows, it uses backslashes (reports\summary.txt); on Linux and macOS it uses forward slashes (reports/summary.txt).

导读：如果你的代码是用 Python 编写的，你应该使用 Textual 来帮助你编写 TUI（文本用户界面）。 本文字数：24584，阅读时长 ...

Not every programmer likes creating GUI code. Most hacker types don’t mind a command line interface, but very few ordinary users appreciate them. However, if you write command line programs in Python, ...