[Eric] Re: Question about imported modules and paths in Eric4

Tue Dec 23 13:02:25 GMT 2008

Hi,

I think, the main problem is at which step the environment is set up. One 
cannot compare eric4 being started via a desktop shortcut or menu entry and a 
Python shell started from a terminal window because the environment will be 
different.

To compare the two setups, one has to start eric4 in a terminal window as well 
(just type "eric4") and check, if the behaviour is different.

As to the matplotlib problem mentioned by Serge I wasn't able to run the 
samples provided because I get a segfault (even when run in a Python shell 
started from the terminal). That may be a problem of my computer setup over 
here.

Regards,
Detlev

On Dienstag, 23. Dezember 2008, Robert Cheatham wrote:
> Thanks, Serge.
>
> Our problems give similar results but I bet that it has something to
> do with the environment I'm working in.  We have hundreds of projects
> and we have to import a new environment into the shell every time we
> want to work on something.  I suspect it has something to do with the
> configuration the systems admins have set up.  Like you said, you
> don't have the problem with inheriting the PYTHONPATH, and neither did
> Detlev or Sjujsckij.
>
> Hopefully I can get this fixed and start using Eric after the
> holidays.  We have one camp that are the hard-core command line guys
> that don't really care about IDE's, and the other camp are people that
> don't have a programming background but have learned to use Python and
> just debug with print statements.  If I can get Eric4 to work I know I
> can get that second camp to use Eric and that they'd love it! :)  Also
> it would make my life much easier.
>
> Best,
> Robert
>
> On Tue, Dec 23, 2008 at 11:03 PM, Serge Montagnac <obs.psr at wanadoo.fr> 
wrote:
> > Robert Cheatham wrote:
> >
> > The Python versions are the same.  I think I'll need to consult some of
> > the wiser people around here when they get back from holiday.  I was
> > hoping it was something simple but there are probably some strange things
> > about our environment that I don't understand.  I'll post again once I
> > get it figured out.
> >
> > Thanks to everyone for your helpful responses!
> >
> >> Пожалуйста
> >
> > I can't compete with that. :)
> >
> > On Tue, Dec 23, 2008 at 8:46 AM, Sjujsckij Nickolaj <sterkrig at home.no> 
wrote:
> >>  Also see if Python shell and eric run the same Python (not 2.4 and 2.5,
> >> for example), as you use quite old system. And try to work out, what's
> >> the difference between PYTHONPATHs and if you're lucky eliminate the
> >> reason. Dou you have Eric (and dependencies) properly installed, by the
> >> way? You know, .deb's from repositories, apt-get install and so on. For
> >> here Eric picks up variables all right too.
> >>
> >>> Tusen takk.
> >>
> >>  Пожалуйста (-:E
> >>
> >>> Ha ha ha!  My fault.  It's actually Kubuntu 7.*, running KDE 3.5.6.
> >>> Thank you for your response.
> >>>
> >>> Yes, when running Python from the shell, the 'sys.path' variable has
> >>> included the information in the 'PYTHONPATH' variable from the shell.
> >>> Additionally, running the commands "os.environ['PYTHONPATH']" and
> >>> "os.system('echo $PYTHONPATH')" outputs the correct 'PYTHONPATH'
> >>> information.
> >>>
> >>> However, it appears that Eric4 creates its own environment.  The
> >>> 'sys.path' variable does not include the 'PYTHONPATH' information from
> >>> the shell in which Eric4 was started.  Also, while the
> >>> "os.environ['PATH']" and "os.system( 'echo $PATH')" commands work
> >>> properly when run from Eric4, their values are different from the
> >>> 'PATH' variable in the original shell.  The "os.environ['PYTHONPATH']"
> >>> and "os.system('echo $PYTHONPATH')" commands fail, indicating that the
> >>> environment created by Eric4 is not the same as in the original shell.
> >>>
> >>> The above may be intentional, however I would like to be able to do
> >>> one of the following:
> >>>
> >>> 1) Get Eric4 to inherit the PYTHONPATH information from the shell in
> >>> which it is launched
> >>>
> >>> 2) Copy-paste the information from the PYTHONPATH variable into a
> >>> search path in the Eric4 project.
> >>>
> >>> 3) Run a short script at the beginning of my programs something to the
> >>> effect of this:
> >>>        newPaths = os.system( "Get PYTHONPATH info from original shell"
> >>> ) sys.path.append( newPaths )
> >>>
> >>> Options 1) and 3) are preferable so that all the environment info will
> >>> be picked up automatically.
> >>>
> >>> If neither option is possible, I can manually insert the search paths
> >>> using multiple "sys.path.append()" commands, but this will be a
> >>> maintenance headache and will be tougher to convince others to move
> >>> away from print statement debugging.  I am, of course, open to
> >>> other/better options.
> >>>
> >>> Tusen takk.
> >>> --Robert
> >>>
> >>> On Sun, Dec 21, 2008 at 10:38 AM, Sjujsckij Nickolaj <sterkrig at home.no> 
wrote:
> >>>>  Hello
> >>>> I think you should learn about modules and their paths in Python. For
> >>>> example, I don't know what is module gto, probably it's your own one,
> >>>> and you rely on current dir importing it... So read about PYTHONPATH
> >>>> and inspect its value in your user shell, python and Eric shells
> >>>> (sys.path), and remember about importing from current directory.
> >>>>
> >>>>> Using Eric4 v4.2.3 (r2620) on KDE 7.
> >>>>
> >>>>  Whoops! Could you lend me your time machine? (-:E
> >>>>
> >>>>> I still haven't been able to figure this out.
> >>>>>
> >>>>> More specifics, I'm importing a module named "gto" as such:
> >>>>>> import gto
> >>>>>
> >>>>> This works fine if I run my python script from the command line. 
> >>>>> When I debug the script in Eric4 I get the following error
> >>>>>
> >>>>>> The debugged program raised the exception ImportError
> >>>>>> "No module named gto"
> >>>>>
> >>>>> So I'm wondering how I can get Eric4 to import the environment from
> >>>>> the shell.  Or at least how I can specify the paths in which Eric4
> >>>>> will look for modules.
> >>>>>
> >>>>> Using Eric4 v4.2.3 (r2620) on KDE 7.
> >>>>>
> >>>>> Thanks,
> >>>>> Robert
> >>>>>
> >>>>> On Tue, Dec 16, 2008 at 4:18 PM, Robert Cheatham
> >>>>>
> >>>>> <robertcheatham at gmail.com> wrote:
> >>>>>> I'm trying to use Eric4 for python debugging in Linux
> >>>>>>
> >>>>>> I'm having a problem with imported modules.  These modules are found
> >>>>>> somewhere in our system's path variables (not sure where).  The
> >>>>>> project I'm trying to debug works fine when run from the command
> >>>>>> line (and when debugged under pdb), but Eric4 apparently doesn't
> >>>>>> pick up the environment from the shell in which it was started, so
> >>>>>> an error is thrown when attempting to import certain modules.
> >>>>>>
> >>>>>> I'm used to working on Visual Studio, so my first instinct was to
> >>>>>> just copy the information from the path variables into the the path
> >>>>>> variable in the Eric4 project.  I can't figure out how to do this. 
> >>>>>> Is there a way to get Eric4 to either pick up the environment
> >>>>>> variables from the shell or to transfer the path information so that
> >>>>>> Eric4 can use it?
> >>>>>>
> >>>>>> Using Eric4 v4.2.3 (r2620) on KDE 7.
> >>>>>>
> >>>>>>
> >>>>>> Thank you.
> >>>>>
> >>>>> _______________________________________________
> >>>>> Eric mailing list
> >>>>> Eric at riverbankcomputing.com
> >>>>> http://www.riverbankcomputing.com/mailman/listinfo/eric
> >>
> >> --
> >> Trollen pynkere vrekukka!
> >>  Ŝtérkrìg
> >> _______________________________________________
> >> Eric mailing list
> >> Eric at riverbankcomputing.com
> >> http://www.riverbankcomputing.com/mailman/listinfo/eric
> >
> > ________________________________
> > _______________________________________________
> > Eric mailing list
> > Eric at riverbankcomputing.com
> > http://www.riverbankcomputing.com/mailman/listinfo/eric
> >
> >
> > Hi Robert,
> > I discussed a bit with Detlev Offenbach concerning modules inclusion in
> > Eric4, due to a problem in external classes declaration with Matplotlib
> > ....
> >
> > I think that we have a clear problem, simple to describe :
> >
> > In Eric4, I declare :
> > from mplwidget import MyMplCanvas, Toolbar
> > or,
> > from mplwidget import *
> >
> > Eric4 finds MyMplCanvas but complains that it "can't import name Toolbar
> > ".
> >
> > If I write  the class Toolbar()  in the main module .... it works,
> > Toolbar class is found, for sure ;-)
> >
> > If I launch the program from command line : python  the_program.py
> > ....it works perfectly with either the first or second import
> > declaration.
> >
> >
> > I conclude that Eric4 as a problem importing several classes declared in
> > an external module.
> >
> > What do think about that, .... I did not experienced any problem with
> > PYTHONPATH, but I am using the traditional /usr/lib/python tree ....
> >
> > My config is Mandriva-2008-1:
> > Python 2.5.2
> > From RiverBanks :
> > Qt 4.3.4
> > sip 4.7.7
> > QScintilla 2.3
> > eric4  4.2.4a(r2717)
> >
> > Best regards,
> > Serge.
> >
> > --
> >
> > /* If Linux doesn't have the solution, you have the wrong problem */
> > --------------------------
> >      Serge Montagnac
> >   http://www.obs-psr.com
> >     obs-psr at orange.fr
> > --------------------------
>
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> Eric at riverbankcomputing.com
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-- 
Detlev Offenbach
detlev at die-offenbachs.de