FreeCAD external Python interpreter will not return body object on Ubuntu 20.04

[openBrain]

According https://packages.ubuntu.com/search?keywords=python3 , current version in 20.04 is 3.8.2...

[Aleks]

I did not compile FreeCAD. I just downloaded it prebuild. I am using the system installation of python to access FreeCAD through the python interface.

[openBrain]

I did not compile FreeCAD. I just downloaded it prebuild. I am using the system installation of python to access FreeCAD through the python interface.

Can you post full FC info from the faulty installation ?

[Aleks]

There is no revision number in the info.

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>>> c=App.ConfigDump()
>>> 
>>> c["BuildVersionMinor"]
'19'
>>> c["BuildVersionMajor"]
'0'
>>> c["BuildRevision"]
''
>>> c["BuildRevisionDate"]
'2021/07/21 08:10:00'
>>> c["BuildRevisionBranch"]
'unknown'
>>> c["BuildRevisionHash"]
'0d9536ed3e8c7f40197b5606e1b7873625e1d6fe'
>>> c["BuildRepositoryURL"]
'git://github.com/FreeCAD/FreeCAD.git unknown'
>>> c["OCC_VERSION"] 
Traceback (most recent call last):
  File "<input>", line 1, in <module>
KeyError: 'OCC_VERSION'

[openBrain]

There is no revision number in the info.

OK, as you're in headless mode (I guess), let's do it simple.

Can you start

Code: Select all

freecad -c

then enter

Code: Select all

import sys
sys.version

[Aleks]

Just to sum up for others so you dont have to read through the whole topic:

On Ubuntu 20.04 and using an to FreeCAD external python interpreter I want to access a body object inside a document through FreeCADs python interface. I am importing FreeCAD in the system python interpreter. But freecad wont return the body object. Can anyone reproduce this? Maybe you know what the problem is.

To reproduce it use this testfile with two simple objects, one body (PartDesign workbench) and one Extrude feature (Part workbench) and the code below.
You can also create your own testfile with a body object.

test.FCStd

(11.05 KiB) Downloaded 51 times

Returning the extrude object works, while returning the body does not work.

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import sys

# Set test file directory
FREECAD_FILES = '/home/aleksander/test-multi-flask-freecad/freecad-files'

# Initialize FreeCAD python interface
sys.path.append('/usr/lib/freecad-python3/lib')
try:
    import FreeCAD
except ValueError:
        print('FreeCAD library not found. Please check the if the FREECAD_PATH variable is correctly set')

try:
    import Part
except:
    print('One of the FreeCAD workbenches is missing.')

try:
    doc = FreeCAD.openDocument(str(os.path.join(FREECAD_FILES, 'test.FCStd')))
    print('FreeCAD file successfully loaded!')
except:
    print('FreeCAD file could not be loaded')

body = doc.getObject('Body')
extrude = doc.getObject('Extrude')
print(body)
print(extrude)

My freecad python interpreter

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freecad -c
[FreeCAD Console mode <Use Ctrl-D (i.e. EOF) to exit.>]
>>> import sys
>>> sys.version
'3.8.10 (default, Jun  2 2021, 10:49:15) \n[GCC 9.4.0]'

And this is the system interpreter

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python3
>>> import sys
>>> sys.version
'3.8.10 (default, Jun  2 2021, 10:49:15) \n[GCC 9.4.0]'

[openBrain]

Unfortunately I no more have a computer with 20.04 installed. Hopefully one may test it and report.

[jbi]

Hi,
I had issues with the file permissions on my server. Have you checked this?

[Aleks]

Permissions of what file? The problem also exist when trying to return a body from an external interpreter locally.
Returning other objects from the document works. Just returning bodies does not work, which is a problem.

[jbi]

Files which i uploaded with the webapp, and which i tried to access with the external python interpreter. I am using also a virtual environment for the webapp, and process the data with an external daemon which uses the freecad libaries. The solution in my case was add the daemon user to the webapp user.