CFD Online Discussion Forums - [OpenFOAM] paraview v4 - building with python

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- - [OpenFOAM] paraview v4 - building with python - OF2.3.0, PVv4, Python 2.7 (https://www.cfd-online.com/Forums/paraview/137301-paraview-v4-building-python-of2-3-0-pvv4-python-2-7-a.html)

paraview v4 - building with python - OF2.3.0, PVv4, Python 2.7

Hi Foamers,

since I want to use the feature Edit | Find Data in ParaView v4 I've successfully followed wyldckat's instructions.

To set-up the Python environment, I added the following lines in "~/.bashrc", after the line for OpenFOAM that ends with bashrc:

Quote:

source /home/user/OpenFOAM/OpenFOAM-2.2.0/etc/bashrc WM_NCOMPPROCS=4 WM_MPLIB=SYSTEMOPENMPI
#added these lines
export PYTHONPATH=$PYTHONPATH:/usr/lib/python2.7/site-packages
export PYTHONPATH=$PYTHONPATH:$ParaView_DIR/lib/paraview-3.12/site-packages

Quote:

Start a new shell terminal. Then run python:
Code:
python

Now, within the python shell, run:
Code:
import paraview
import vtk
from paraview.simple import *

The red marked line induces an error:

Code:

Error: Could not import vtkCommonComputationalGeometryPython

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File "/home/elisabeth/OpenFOAM/ThirdParty-2.3.0/platforms/linux64Gcc/ParaView-4.1.0/lib/paraview-4.1/site-packages/paraview/simple.py", line 41, in <module>

    import servermanager

  File "/home/elisabeth/OpenFOAM/ThirdParty-2.3.0/platforms/linux64Gcc/ParaView-4.1.0/lib/paraview-4.1/site-packages/paraview/servermanager.py", line 48, in <module>

    import paraview, re, os, os.path, new, sys, atexit, vtk

  File "/home/elisabeth/OpenFOAM/ThirdParty-2.3.0/platforms/linux64Gcc/ParaView-4.1.0/lib/paraview-4.1/site-packages/paraview/vtk/__init__.py", line 7, in <module>

    from vtkCommonCorePython import *

ImportError: No module named vtkCommonCorePython

Quote:

Now,
there is one important detail: pvpython is the advised application for interacting with Python + ParaView. To run it, simply run:
Code:
pvpython

The last step works, I can start the interpreter from shell.

Does the error cause further problems?

Aylalisa

Hi,

This line is for PV 3.12

Code:

export PYTHONPATH=$PYTHONPATH:$ParaView_DIR/lib/paraview-3.12/site-packages

while, according to your error, you've got version 4.1.0. So if your PV is really built with python support export should be something like:

Code:

export PYTHONPATH=$PYTHONPATH:$ParaView_DIR/lib/paraview-4.1/site-packages:$ParaView_DIR/lib/paraview-4.1/site-packages/vtk

and then you can

Code:

$ python

Python 2.7.6 (default, Nov 21 2013, 15:55:38) [GCC] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from paraview.simple import *

paraview version 4.1.0

>>>

(tested on openSUSE 13.1)

Hi Alexey,

my .bashrc file

Code:

PYTHONPATH=$PYTHONPATH:/usr/lib64/python2.7/site-packages

PYTHONPATH=$PYTHONPATH:/home/aylalisa/OpenFOAM/ThirdParty-2.3.0/platforms/linux64Gcc/ParaView-4.1.0/lib/paraview-4.1/site-packages

export PYTHONPATH

Aylalisa

According to your path /vtk is missing.

I've add /vtk --> it works. I get this output, too! Thank you!

Aylalisa

Hi,

in my code snippet there was .../paraview-4.1/site-packages but also .../paraview-4.1/site-packages/vtk.

Without second entry I had the following error:

Code:

$ export PYTHONPATH=$PYTHONPATH:$ParaView_DIR/lib/paraview-4.1/site-packages

$ python

Python 2.7.6 (default, Nov 21 2013, 15:55:38) [GCC] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from paraview.simple import *

Error: Could not import vtkCommonComputationalGeometryPython

Traceback (most recent call last):

  File "<stdin>", line 1, in <module>

  File ".../ParaView-4.1.0/lib/paraview-4.1/site-packages/paraview/simple.py", line 41, in <module>

    import servermanager

  File ".../ParaView-4.1.0/lib/paraview-4.1/site-packages/paraview/servermanager.py", line 48, in <module>

    import paraview, re, os, os.path, new, sys, atexit, vtk

  File ".../ParaView-4.1.0/lib/paraview-4.1/site-packages/paraview/vtk/__init__.py", line 7, in <module>

    from vtkCommonCorePython import *

ImportError: No module named vtkCommonCorePython

>>>

while with the second folder in PYTHONPATH:

Code:

$ export PYTHONPATH=$PYTHONPATH:$ParaView_DIR/lib/paraview-4.1/site-packages:$ParaView_DIR/lib/paraview-4.1/site-packages/vtk

$ python

Python 2.7.6 (default, Nov 21 2013, 15:55:38) [GCC] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> from paraview.simple import *

paraview version 4.1.0

>>>

Though if I use pvpython, I even don't need to modify PYTHONPATH.

The only change I made was to add site-packages/vtk at the end of the second path variable set-up.

Before that change I've received the error. After changing and sourcing .bashrc I've received...

Code:

>>> from paraview.simple import*

paraview version 4.1.0

>>>

...the desired output :confused:

PYTHONPATH was not set at all on my system. But honestly speaking, I have not tried pvpython before. Am at the beginning concerning usage of python with openfoam and paraview.