[issue14803] Add feature to allow code execution prior to __main__ invocation

[Antoine Pitrou]

Antoine Pitrou added the comment:

> I've switched back to being -1 on the PYTHONRUNFIRST idea. There are
> no ACLs for environment variables, so the security implications scare
> me too much for me to support the feature.

I'm quite sure PYTHONHOME and PYTHONPATH already allow you to mess quite
freely. That's why we have the -E flag.

I'm -0.5 myself, though, for the reason that it complicates the startup
process a little bit more, without looking very compelling. It smells
disturbingly like LD_PRELOAD to me.

> The simple -C option doesn't have that problem, though, and could be
> used as infrastructure in a process infrastructure framework to
> provide enhanced configuration of Python subprocesses.

What do you mean exactly?

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