Cannot load necessary modules: No module named OpenGL.GL

[Gabriel_P]

Trying to run Impressive version 0.10.3-WIP results in an error:

Welcome to Impressive version 0.10.3-WIP
Oops! Cannot load necessary modules: No module named OpenGL.GL
To use Impressive, you need to install the following Python modules:
 - PyOpenGL [python-opengl] http://pyopengl.sourceforge.net/
 - PyGame [python-pygame] http://www.pygame.org/
 - PIL [python-imaging] http://www.pythonware.com/products/pil/
 - PyWin32 (OPTIONAL, Win32) http://starship.python.net/crew/mhammond/win32/
Additionally, please be sure to have pdftoppm or GhostScript installed if you
intend to use PDF input.

All the python packages are installed in my system as is GhostScript. I've tried installing the package 'libgl1-mesa-dev' as per this post http://goo.gl/S5TsJK but it didn't help.

[Daniel Letzeisen (dtl131)]

Can yhou run the following command?:
python -c "from OpenGL import GL"

[Gabriel_P (gabp)]

Sure can, here's the output:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named OpenGL

Just FYI, running

sudo apt-get install python-opengl

tells me that it is already installed.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Simon Davis (davis-decent)]

Exactly the same problem here:

$ sudo apt-get install python-opengl
Reading package lists... Done
Building dependency tree
Reading state information... Done
python-opengl is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

$ python -c "from OpenGL import GL"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
ImportError: No module named OpenGL

[Simon Davis (davis-decent)]

Sorry, figured it out a second later. It was caused by a wrong use of virtualenv by the application here. Everything works just fine now.