[SOLVED] Image not found error when importing QtGui from PyQt4

Image not found error when importing QtGui from PyQt4

I have installed ActivePython 2.7 on Mac OS X 10.5. The main reason for this is to use pypm, the package manager. However, after installing ActivePython and setting up my .bash_profile file to use that version of Python, I encounter a lot of problems with the pypm-installed libraries. To install all of these modules, I just type

pypm install <package-name>

and this is how I got matplotlib, PyQt4, PIL, etc. The problem is that all of these appear to install with no problems, they place the correct .pth and .so files into the correct site-packages folder, and basic imports work fine. But I get the following errors.

First, here is what I see when checking for Python on my machine:

new-host:site-packages ely$ which python
/usr/local/bin/python

new-host:site-packages ely$ ls -l /usr/local/bin/python
lrwxr-xr-x  1 root  wheel  60 May 25 22:15 /usr/local/bin/python -> /Library/Frameworks/Python.framework/Versions/2.7/bin/python

Next, I invoke Python and attempt to import things.

new-host:site-packages ely$ python
ActivePython 2.7.1.4 (ActiveState Software Inc.) based on
Python 2.7.1 (r271:86832, Feb  7 2011, 11:33:10) 
[GCC 4.2.1 (Apple Inc. build 5664)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import PyQt4
>>> from PyQt4 import QtGui
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: dlopen(PyQt4/QtGui.so, 2): Library not loaded: QtGui.framework/Versions/4/QtGui
Referenced from: /Users/ely/Library/Python/2.7/lib/python/site-packages/PyQt4/QtGui.so
Reason: image not found

So the above shows that PyQt4 imports with no complaints, but then I get the 'image not found' error when I try to use any of the sub-modules. For another example, here is the standard matplotlib.

>>> import matplotlib
>>> import matplotlib.pyplot as plt
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "matplotlib/pyplot.py", line 23, in <module>
from matplotlib.figure import Figure, figaspect
File "matplotlib/figure.py", line 16, in <module>
import artist
File "matplotlib/artist.py", line 6, in <module>
from transforms import Bbox, IdentityTransform, TransformedBbox, TransformedPath
File "matplotlib/transforms.py", line 34, in <module>
from matplotlib._path import affine_transform
ImportError: dlopen(matplotlib/_path.so, 2): Symbol not found: __ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_l
Referenced from: /Users/ely/Library/Python/2.7/lib/python/site-packages/matplotlib/_path.so
Expected in: dynamic lookup

>>> from matplotlib import pyplot
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "matplotlib/pyplot.py", line 23, in <module>
from matplotlib.figure import Figure, figaspect
File "matplotlib/figure.py", line 16, in <module>
import artist
File "matplotlib/artist.py", line 6, in <module>
from transforms import Bbox, IdentityTransform, TransformedBbox, TransformedPath
File "matplotlib/transforms.py", line 34, in <module>
from matplotlib._path import affine_transform
ImportError: dlopen(matplotlib/_path.so, 2): Symbol not found: __ZSt16__ostream_insertIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_PKS3_l
Referenced from: /Users/ely/Library/Python/2.7/lib/python/site-packages/matplotlib/_path.so
Expected in: dynamic lookup

Any thoughts on why the pypm-installed versions are so problematic? I've used ActivePython and pypm on my Ubuntu work computer for a long time and never had any of these issues. Everything I've ever installed with pypm has worked beautifully. Why is it so different on Mac?

Solution

Make sure python and qt have same architecture (32bit vs 64bit)

for mathplot looks like a different g++ used to compile python and mathplot

have you tried with stock osx python?