How a script can know if it has been called with the -i command line option? - Page 2

Michele Simionato

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?
TIA,

Michele Simionato

Dec 21 '06

Subscribe Reply

1443

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
~~~~~~~~~~~~~~~ ~~~~~~~~~~~
Dancing Bison Enterprises
http://www.dancingbison.com
http://dancingbison.blogspot.com
~~~~~~~~~~~~~~~ ~~~~~~~~~~~
Check out the cool Snap.com preview feature on my web site.
Free signup for anyone at www.snap.com
I'm not affiliated with it.

Dec 23 '06 #11

vasudevram

vasudevram wrote:

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
~~~~~~~~~~~~~~~ ~~~~~~~~~~~
Dancing Bison Enterprises
http://www.dancingbison.com
http://dancingbison.blogspot.com
~~~~~~~~~~~~~~~ ~~~~~~~~~~~
Check out the cool Snap.com preview feature on my web site.
Free signup for anyone at www.snap.com
I'm not affiliated with it.

Just realized: getting the python process's process id is possible from
the Python program itself, using os.getpid().

Vasudev

Dec 23 '06 #12

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