Carl Meyer <c...@oddbird.net> added the comment:

Environment variable seems to make a bit more sense for this, since it's not 
per-invocation; there's no point writing bytecode cache to a particular 
location unless the next invocation reads the cache from there.

Our use case includes a webserver process that embeds Python; I'm not sure if 
we could pass a CLI arg to it or not.

Python has lots of precedent for similar environment variables (e.g. 
`PYTHONHOME`, `PYTHONDONTWRITEBYTECODE`, `PYTHONPATH`, etc). Compared to those, 
`PYTHONBYTECODEPATH` is pretty much harmless if it "leaks" to an unintended 
process.

I asked Brett Cannon in the sprints if I should add a CLI flag in addition to 
the env var; he suggested it wasn't worth it. I'm not opposed to adding the CLI 
flag, but I think removing the env var option would be a mistake.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33499>
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