How a script can know if it has been called with the -i command line option?

[vasudevram]

Peter  Wang wrote:
> Michele Simionato wrote:
> > The subject says it all, I would like a script to act differently when
> > called as
> > $ python script.py and when called as $ python -i script.py. I looked
> > at the sys module
> > but I don't see a way to retrieve the command line flags, where should
> > I look?
>
> I realize this is quite a hack, but the entire command line is
> preserved in the process's entry in the OS's  process table.  if you do
> "ps -ax" you will see that the interpreter was invoked with -i.  I
> didn't test this under windows, but it works on Mac and Linux.

That hack might not work - at least, as described, and on Linux or Mac
OS if the UNIX-based one, i.e. OS X). Because there could be other
users who ran python command lines with or without the -i option. As
described, there's no way for this user to know which python invocation
is his/hers, and which are of other users. There might be a way,
though, if we can get this user's python instance's process id and then
grep for a line containing that id (in the appropriate column) in the
ps output.

Vasudev Ram
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