Re: [Jython-users] Current Directory No Longer on sys.path?

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

Hi all,

hopefully a bit of background information can shed a light on this

The prepending of '.' in sys.path was removed here:
  http://jython.svn.sourceforge.net/viewvc/jython?view=rev&revision=3109

referring to this bug:
  http://sourceforge.net/tracker/index.php?func=detail&aid=1599012&group_id=12867&atid=112867

I'd go with David, saying you can add the current directory if you
really need to:
  sys.path.insert(0, os.getcwd())

Best wishes,
Oti.

On Nov 29, 2007 7:33 PM,  <Mar...@am...> wrote:
>
> I found the difference.  In Jython 2.1, inside PySystemState#initPath, it
> looks like this:
>
>     private static PyList initPath(Properties props) {
>         PyList path = new PyList();
>         if (!Py.frozen) {
>             addPaths(path, props.getProperty("python.prepath", "."));
>
> Whereas in Jython 2.2. it looks like this:
>
>         PyList path = new PyList();
>         if (!Py.frozen) {
>             addPaths(path, props.getProperty("python.prepath", ""));
>
> I'm assuming that the default value of an empty string (in the Jython 2.2
> code) does not get stuck onto the path because the tokenizing of an empty
> string does nothing.  I'm thinking this is probably a bug.
>
> Mark.
>  ----------------------------------------------------------
>
>
>
>
>
> Mar...@am...
> Sent by: jyt...@li...
>
> 11/29/2007 01:26 PM
>
> To David Niergarth <dn...@hd...>
>
> cc David Handy <Dav...@sa...>, "jyt...@li..."
> <jyt...@li...>
>
> Subject Re: [Jython-users] Current Directory No Longer on sys.path?
>
>
>
>
>
>
>
>  > David Handy wrote:
>  > > Yes, it looks like in Jython 2.1, the current directory was put in  as
>  > > the second item sys.path. It also looks like CPython 2.4 put the
> current
>  > > directory as the 3rd item in sys.path.
>  >
>  > I see it as the second item in CPython 2.4. In CPython 2.4.4, it
>  > doesn't appear
>  > at all so the change must have happened somewhere in the development
>  > of the 2.4
>  > series. I didn't realize the current directory was being added explicitly
> in
>  > earlier versions; it seems redundant with '' (read on).
>  >
>
>  That's the thing - I don't have '' in my sys.path.  However, I should have
> mentioned my use case.  I am embedding an interpreter in Eclipse, not
> running Jython from the command line.  So I just ran Jython 2.2 from the
> command line and I see now that there is in fact a '' at the beginning.
> (Weird.  I didn't know that '' was the equivalent of '.' - is this specific
> to Jython, or is it some generally accepted convention I was not aware of)?
> So, this prompted me to look into why there was no '' element in my embedded
> interpreter.  I pretty quickly found that the full path to a script passed
> on the command line or '' is inserted by the class org.python.util.jython
> (as confirmed by David's latest email) like so:
>
>         // was there a filename on the command line?
>         if (opts.filename != null) {
>             String path = new java.io.File(opts.filename).getParent();
>             if (path == null)
>                 path = "";
>             Py.getSystemState().path.insert(0, new PyString(path));
>  .
>  .
>         else {
>             // if there was no file name on the command line, then "" is
>             // the first element on sys.path.  This is here because if
>             // there /was/ a filename on the c.l., and say the -i option
>             // was given, sys.path[0] will have gotten filled in with the
>             // dir of the argument filename.
>             Py.getSystemState().path.insert(0, new PyString(""));
>  .
>  .
>
>
>  OK...I am not sure I follow the second comment here, but it appears then
> that to maintain this behaviour I will need to manually insert either '' or
> '.' into my sys.path in Jython 2.2 (if I am creating/embedding my own
> interpreter).  However, that still does not answer the question as to why I
> was seeing '.' in my sys.path before - when I am fairly certain I did not
> place it there (see below).
>
>
>  > > But CPython 2.5.1 does not put
>  > > the current directory in sys.path at all. Nor does Jython 2.2.
>  >
>  > Yes, but in all cases (python 2.1 thru 2.5 and jython 2.2), the first
> item in
>  > sys.path is '', which I always took to be the equivalent of '.' in the
> shell.
>  > Here's verification:
>  >
>  > (%:~/tmp)- cat > test.py
>  > x = 1
>  > y = 2
>  >
>  > (%:~/tmp)- jython
>  > Jython 2.2.1 on java1.6.0_03
>  > Type "copyright", "credits" or "license" for more information.
>  >  >>> import sys
>  >  >>> sys.path
>  > ['', '/home/dn/apps/jython2.2.1/Lib', '__classpath__']
>  >  >>> sys.path.pop(0)
>  > ''
>  >  >>> sys.path
>  > ['/home/dn/apps/jython2.2.1/Lib', '__classpath__']
>  >  >>> import mytest
>  > Traceback (innermost last):
>  >    File "<console>", line 1, in ?
>  > ImportError: no module named mytest
>  >  >>> sys.path.insert(0, '')
>  >  >>> sys.path
>  > ['', '/home/dn/apps/jython2.2.1/Lib', '__classpath__']
>  >  >>> import mytest
>  >  >>> mytest.x, mytest.y
>  > (1, 2)
>  >
>  >
>  > Mar...@am... wrote:
>  > > Sure enough, if it check out sys.path in our Jython 2.1-based
>  > > product, the first entry in sys.path is ".", but it is not there
>  > > in our Jython 2.2-based product.
>  >
>  > In any case, this doesn't seem to address Mark's problem. I don't see '.'
> in
>  > sys.path for any version of python or jython. Are you talking about
> importing
>  > jython modules from jython or something else? And I do seem to be able to
>  > import jython modules from the current directory with jython 2.2.
>  >
>
>  Well, this is the odd part.  I am quite certain I did not put '.' on my
> sys.path in Jython 2.1, but it is there - both in a command line console app
> we have (that also creates an embedded interpreter), as well as in my
> embedded Eclipse interpreter.  Here is my command line app:
>
>  >>> import sys
>  >>> sys.path
>  ['.',
> 'C:\\PROGRA~1\\AMIS\\SIGNAK~1\\eclipse\\plugins\\com.amis.jython_2.1.0.v20070712\\Lib',
> 'C:\\PROGRA~1\\AMIS\\SIGNAK~1\\\\scripts', 'C:\\Documents and
> Settings\\Paul\\scripts']
>
>  In this case, I am calling Jython via java with
> -Dpython.path=%EDK_HOME%\scripts;%HOMEDRIVE%%HOMEPATH%\scripts.  I can see
> these items as the last two items in sys.path, but something is sticking the
> first two items in there.  I assume the Lib dir is coming from my setting of
> python.home, but I don't know where '.' is coming from.
>
>
>  And my Eclipse-based interpreter:
>
>  >>>import sys
>  >>>sys.path
>  ['C:\\Documents and Settings\\Paul\\workspace\\Test\\scripts', '.',
> 'C:\\Program Files\\AMIS\\SignaKlara Tools
> 4\\eclipse\\plugins\\com.amis.jython_2.1.0.v20070712\\Lib', 'C:\\Documents
> and Settings\\Paul\\scripts', 'C:\\Program Files\\AMIS\\SignaKlara Tools
> 4\\scripts']
>
>  This looks right because I am inserting the first element manually, and the
> rest matches the behvaiour I see in my command line console (well...aside
> from the order - I need to fix that).  Both of these cases simply create and
> embed an InteractiveConsole.  I am not sure where the '.' is coming from
> however.  I guess I'll go back in time in our CVS tree and try to see if
> Jython 2.1 is doing this somewhere.  The only difference I see right now in
> how I initialize Jython is that I do a
> PySystemState.initialize(System.getProperties()...), whereas the jython
> command line class initializes it like
> PySystemState.initialize(PySystemState.getBaseProperties(),...).
>
>  Thanks for the responses.
>  Mark.
>
> AMI Semiconductor - "Silicon Solutions for the Real World"
>  NOTICE:
>  This electronic message contains information that may be confidential or
> privileged. The information is intended for the use of the individual or
> entity named above. If you are not the intended recipient, please be aware
> that any disclosure, copying, distribution or use of the contents of this
> information is prohibited. If you received this electronic message in error,
> please notify the sender and delete the copy you received.
>
> -------------------------------------------------------------------------
>  SF.Net email is sponsored by: The Future of Linux Business White Paper
>  from Novell.  From the desktop to the data center, Linux is going
>  mainstream.  Let it simplify your IT future.
>
> http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4_______________________________________________
>  Jython-users mailing list
>  Jyt...@li...
>  https://lists.sourceforge.net/lists/listinfo/jython-users
>
>
>
> AMI Semiconductor - "Silicon Solutions for the Real World"
> NOTICE:
> This electronic message contains information that may be confidential or
> privileged. The information is intended for the use of the individual or
> entity named above. If you are not the intended recipient, please be aware
> that any disclosure, copying, distribution or use of the contents of this
> information is prohibited. If you received this electronic message in error,
> please notify the sender and delete the copy you received.
>
>
> -------------------------------------------------------------------------
> SF.Net email is sponsored by: The Future of Linux Business White Paper
> from Novell.  From the desktop to the data center, Linux is going
> mainstream.  Let it simplify your IT future.
> http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4
> _______________________________________________
> Jython-users mailing list
> Jyt...@li...
> https://lists.sourceforge.net/lists/listinfo/jython-users
>
>