#221 pyFoamPVSnapshot.py with pvpython3 not working

[Robin Rosenstock]

Please see my post: https://www.cfd-online.com/Forums/openfoam-post-processing/193342-pyfoampvsnapshot-pvpython3-not-working.html

[Bernhard Gschaider]

Seems your version of Paraview is compiled with Python3 instead of Python2. Which is not bad but a bit unusual: the binaries that KitWare delivers are still using python2 so the problem didn't bite anyone yet.

At the time that these utilies were made Paraview didn't even pretend to support Python3 so I never bothered to make the sources compatible with Python2 and Python3

The first problem (changed syntax for print) you did already solve. Athough a better solution would be to use

from PyFoam.ThirdParty.six import print_

and then use print_ instead of print. That way it would be compatible with python2 and 3

The second problem is a change in the way Python3 imports modules that are in the same directory. Replace

from PyFoamApplication import PyFoamApplication

with

from .PyFoamApplication import PyFoamApplication

and everything should be fine. Except for possible other errors that haven't surfaced yet.

Should these changes be sufficient could you please attach the modified file here and I'll work them into the code-base. Otherwise I'll have a look next week in the office where I happen to have a virtual machine with Manjaro. What I'd need to know: where did you get the paraview with python3?

[Robin Rosenstock]

Hello Bernhard Gschaider,
yes, I've compiled Paraview myself from this Aur: https://aur.archlinux.org/packages/paraview/
After making the changing your suggested, I get this output when executing PyFoamPVSnapshot.py

Executing PVSnapshot with pvpython trough a proxy-script options: 
Traceback (most recent call last):
  File "/tmp/pyFoamPVSnapshot_i61_e_7z.py", line 4, in <module>
    PVSnapshot()
  File "/home/robin/miniconda3/lib/python3.6/site-packages/PyFoam/Applications/PVSnapshot.py", line 54, in __init__
    **kwargs)
  File "/home/robin/miniconda3/lib/python3.6/site-packages/PyFoam/Applications/PyFoamApplication.py", line 326, in __init__
    self.addOptions()
  File "/home/robin/miniconda3/lib/python3.6/site-packages/PyFoam/Applications/PVSnapshot.py", line 85, in addOptions
    help="The type of the bitmap-file. Possibilities are "+", ".join(self.picTypeTable.keys())+". Default: %default")
  File "/usr/lib/python3.6/optparse.py", line 1000, in add_option
    option = self.option_class(*args, **kwargs)
  File "/usr/lib/python3.6/optparse.py", line 581, in __init__
    checker(self)
  File "/usr/lib/python3.6/optparse.py", line 670, in _check_choice
    % str(type(self.choices)).split("'")[1], self)
optparse.OptionError: option --type: choices must be a list of strings ('dict_keys' supplied)

[Bernhard Gschaider]

Replacing

choices=self.picTypeTable.keys()

with

choices=list(self.picTypeTable.keys())

might do the trick

[Robin Rosenstock]

Unfortunatly this does not work:

Traceback (most recent call last):
  File "/tmp/pyFoamPVSnapshot_a5fzq24y.py", line 4, in <module>
    PVSnapshot()
  File "/home/robin/miniconda3/lib/python3.6/site-packages/PyFoam/Applications/PVSnapshot.py", line 54, in __init__
    **kwargs)
  File "/home/robin/miniconda3/lib/python3.6/site-packages/PyFoam/Applications/PyFoamApplication.py", line 326, in __init__
    self.addOptions()
  File "/home/robin/miniconda3/lib/python3.6/site-packages/PyFoam/Applications/PVSnapshot.py", line 113, in addOptions
    help="The type of the geometry-files. Possibilities are "+", ".join(self.geomTypeTable.keys())+". Default: unset. Nothing is written")
  File "/usr/lib/python3.6/optparse.py", line 1000, in add_option
    option = self.option_class(*args, **kwargs)
  File "/usr/lib/python3.6/optparse.py", line 581, in __init__
    checker(self)
  File "/usr/lib/python3.6/optparse.py", line 670, in _check_choice
    % str(type(self.choices)).split("'")[1], self)