The environment variable you're thinking of is `PYTHONUNBUFFERED`, not `UNBUFFERED` [0]. If you want a generic solution to this problem, try the `unbuffer` command [1].

For anyone who's interested, I recommend reading Julia Evan's article [2] about this problem and its solutions.

[0]: https://docs.python.org/3/using/cmdline.html#envvar-PYTHONUN...

[1]: https://manpages.ubuntu.com/manpages/noble/man1/unbuffer.1.h...

[2]: https://jvns.ca/blog/2024/11/29/why-pipes-get-stuck-bufferin...