#Python pop quiz:

What does the following Python3 script output in a standard Linux environment?

import subprocess
print("a")
subprocess.run(["echo", "b"])
print("c")

Assume it is run as `python3 quiz.py | tr \n " "` to turn newlines into spaces.

It's `b a c`, because `print` writes into the sys.stdout *buffer* that only flushes when it goddamn feels like it, whereas `subprocess.run` plucks the file handle out of sys.stdout and hands it to the child process.

If you instead run from a terminal *without* piping to `tr`, or you set `PYTHONUNBUFFERED=1`, then the output is instead in the `a b c` order.

yayyyyy 😭