JYTHONSTARTUP and PYTHONINSPECT

I'm remodelling jython.run along the lines of CPython main for clarity 
and conformity. CPython supports a couple of environment variables it 
has been easy to include. They seem useful, but are maybe not quite done 
in the Jython way. I'm not totally sure whether they should be 
JYTHONsomething or PYTHONsomething, or be registry entries instead, or 
as well. I'm canvassing opinions.

Historically, our policy appears to be that configuration should be done 
via the registry (the registry files and the -D options). We *always* 
label registry items in the style "python.some.thing". We also honour 
some environment variables and mostly call them JYTHONsomething, except 
there's also PYTHONWARNINGS and PYTHONIOENCODING, I suppose because you 
want to see the same values as CPython (I think).

I propose:

JYTHONSTARTUP (registry python.startup) a file to run at the start of an 
interactive session. *J*YTHONSTARTUP because your script is unlikely to 
be the same for CPython. Precedence as with other variables.

PYTHONINSPECT (registry python.inspect) if not empty, effectively sets 
the -i flag. (Any of these sources will *set* the flag, but none can 
turn it off.) It's called *P*YTHONINSPECT because setting it during 
execution should make us drop into interactive mode, instead of exiting, 
when the first SystemExit is raised. A script that does so may not be 
aware it's in Jython, so I favour the standard Python name.

Jeff

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Jeff Allen