Question

Import problem using PyDev and PyQt4

Asked by: easiwriter45

I have successfully installed PyQt4 and PyDev. When I try and run code that uses PyQt I get unresolved import errors on the PyWt stuff. The code works fine if I run it with Idle, so I guess there is a configuration problem, but I'm blowed if I can resolve it. Can anyone help? I've attached a screenshot of the PyDev preferences.

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Asked On
2009-10-10 at 06:56:07ID24801564
Tags

Python Eclipse PyDev

Topics

Python Scripting Language

,

Eclipse

Participating Experts
2
Points
200
Comments
13

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Answers

 

by: HonorGodPosted on 2009-10-10 at 08:13:06ID: 25542572

Into what directories were the modules installed?

It would seem likely that this/these directories are not part of sys.path...

import sys
for DIR in sys.path :
  print DIR

                                              
1:
2:
3:

Select allOpen in new window

 

by: easiwriter45Posted on 2009-10-10 at 08:38:09ID: 25542643

Thanks for the reply. I've attached a screenshot showing the output. There is a PyQt4 folder in site-packages, so I tried adding that to PythonPath, but it made no difference. How do I change sys.path and should I add the dir in site-packages?

 

by: HonorGodPosted on 2009-10-10 at 09:02:06ID: 25542710

http://docs.python.org/tutorial/modules.html

See section 6.1.2 and the PYTHONPATH environment variable for one technique...

 

by: easiwriter45Posted on 2009-10-10 at 13:44:24ID: 25543742

Thanks I've looked at the reference before, but can't find the PYTHONPATH variable, or at least where it gets set (other than in PyDev prefs).

Try as I may I can't kick this thing into life. If I print out the sys.path in Eric4 then it looks exactly the same as when printed out with PyDev in Eclipse. Eric works PyDev doesn't. The PyQt4 folder is the same folder hierarchy as Python, but it doesn't pick it up when it does the scan. So I'm stuck and destined to use Eric unless someone knows how to fix this.

 

by: HonorGodPosted on 2009-10-10 at 18:32:53ID: 25544572

You can set it in your environment before you execute PYTHON.

So, for windows, you could put it in the system environment variables
e.g., something like:

- Right click on "My computer"
- Select "Properties"
- Select "Advanced" tab
- Click "Environment Variables" button
- In the "User variable" section, click the "New" button
- Enter the variable name as "PYTHONPATH"
- In the variable value, enter the complete path to the libraries of interest (separated by a semi-colon ';')
- Click 'OK' to save the Value dialog box
- Click 'OK' to close the Environment variable dialog box
- Click 'OK' to close the System Properties dialog box

- open a new command prompt
- type the following to see the value of the PYTHONPATH environment variable
  echo %PYTHONPATH%

If you don't want to have a permanent change, you could type the following before you execute Python...

set PYTHONPATH=<directory#1>;<directory# 2> ...

and specify the fully qualified directories, separated by semi-colons.

Note: If a directory name contains a blank (space), surround the fully qualified name with double quotes.

For example:

set PYTHONPATH="C:\Program Files\My Directory1";"C:\Program Files\My Directory2"

 

by: easiwriter45Posted on 2009-10-11 at 01:41:25ID: 25545261

I am using a Mac, so set PYTHONPATH up in the Bash profile. The first screenshot shows the output from the env command. I then restarted the system and went in to the PyDev setup, removed the interpreter path and reset everything. There are screenshots of the preferences page and a dump of sys.path. The problem is still there. Maybe the PyQt4 path is wrong, but thats the only one pointing at .so files that I can find. Anyway thanks for all your effort so far. Can you think of anything else - at the moment I am suspecting a bug of some sort.

 

by: mish33Posted on 2009-10-11 at 10:23:55ID: 25546599

Make sure your python (/usr/bin/python) points to /System/Library/Frameworks/Python.framework/Versions/2.6/bin/python

(you may type it in, use symlink, etc.)

 

by: easiwriter45Posted on 2009-10-11 at 10:45:16ID: 25546666

Sorry to sound stupid, but how do I do that (I'm no Unix expert - if that's what it involves). I'm not sure what you mean by 'points to' - are you referring to an environment variable?

 

by: mish33Posted on 2009-10-11 at 18:22:47ID: 25548160

Well I have no Mac around. :(

1st, try to edit PyDev prefs (shown at Screen-shot-2009-10-11-at-09.32..png)
and type the above path to python in (instead of /usr/bin/python).

Also show us 'ls -l /us/bin/python' and '/usr/bin/python' commands output.

Let see if that helps.

 

by: easiwriter45Posted on 2009-10-11 at 23:11:49ID: 25548864

Still no change. I've attached the output.

 

by: easiwriter45Posted on 2009-10-13 at 05:20:56ID: 25559125

I've solved the problem - it is a bug in PyDev documented at http://sourceforge.net/tracker/index.php?func=detail&aid=2855598&group_id=85796&atid=577329.

Many thanks to HonorGod and Mish33 for your efforts.

 

by: HonorGodPosted on 2009-10-13 at 05:24:05ID: 25559146

Thanks for sharing the solution!

 

by: HonorGodPosted on 2009-10-18 at 06:59:13ID: 25599870

Thanks for the assist and the points.

Thank you also for sharing the solution!

Good luck & have a great day.

20120131-EE-VQP-002

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