shobhitk | SideFX

Running Python 3 scripts in Houdini as a Subprocess Nov. 18, 2019, 10:36 p.m.

Hi,

I am trying to run my code in Python 3 from within Houdini using the subprocess module. The script is using PySide2.

Here is my simplified sample script:

import subprocess
import sys
import os

pythonhome = 'C:/python36/'
env = os.environ
env['PYTHONPATH'] = 'C:\\Python36'
env['PYTHONHOME'] = 'C:\\Python36\\bin'
env['PATH'] = env['PATH'].replace('C:/PROGRA~1/SIDEEF~1/HOUDIN~1.258/python27;', '')
print(env['PATH'])

testProc = subprocess.Popen([pythonhome + 'python.exe', r'C:\path\to\python\script.py'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env, shell=True)

while True:
    line = testProc.stdout.readline()
    print(line)
    if not line:
        break

I have tried various combinations of environments and also attempted to run this with a QRunnable and every time I have attempted it, I get some variation of this error:

Fatal Python error: Py_Initialize: unable to load the file system codec

ModuleNotFoundError: No module named ‘encodings’
OR
CodecRegistryError.

Let me know if anyone has any insights on this.

Thanks

Shobhit Khinvasara

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Running Python 3 scripts in Houdini as a Subprocess Nov. 18, 2019, 10:36 p.m.