Forums Technical Discussion import hou

import hou

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phtj
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IHi all,

I am having problems importing hou from a Regular Python Shell. I am using latest versions of Python25, PyDev, Eclipse and Houdini. I have set the system PATH and PYTHONPATH as suggested in the docs, but I get this message when I ‘import hou’:

Traceback (most recent call last):
File “D:\Documents\Eclipse\z_Houdini_test2\test3.py”, line 18, in <module>
import hou
File “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/houdini/scripts/python\hou.py”, line 17, in <module>
import _hou
ImportError: DLL load failed: A dynamic link library (DLL) initialization routine failed.

When I change the Python interpreter from the standard Python25 to the one in Houdini, then it seems to work fine.

Any ideas why this is happening? I found some people having similar issues a while back, but there was no solution. Just wondering if this had now been resolved?

cheers
Patrick
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edward
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The compiler that is used by Houdini has to match the compiler that is used to build python.
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phtj
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Hi Edward,

Thanks - that explains that problem.

So both $HFS/python/bin/python.exe and $HFS/bin/hython.exe are compiled with the right compiler. Both of these give no errors when I import hou.

Now onto the next issue - I want to run this code:
import hou
print hou.node('/obj').createNode('geo')

When I run this using Houdini's hython.exe, it seems to work fine. But when I run it using Houdini's python.exe, I get this message:

cpp error: “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/houdini/soho/parameters/RIB3Delight8.5.ds”:5 Unable to include “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/python/houdini/soho/parameters/CommonMacros.ds”

cpp error: “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/houdini/soho/parameters/RIB3Delight8.5.ds”:72 Unable to include “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/python/houdini/soho/parameters/CommonControl.ds”

cpp error: “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/houdini/soho/parameters/RIB3Delight8.5.ds”:73 Unable to include “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/python/houdini/soho/parameters/CommonView.ds”

cpp error: “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/houdini/soho/parameters/RIB3Delight8.5.ds”:74 Unable to include “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/python/houdini/soho/parameters/CommonObject.ds”

cpp error: “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/houdini/soho/parameters/RIB3Delight8.5.ds”:75 Unable to include “CPROGRA~1/SIDEEF~1/HOUDIN~1.295/python/houdini/soho/parameters/Instance.ds”

geo1

Obviously, houdini.exe is doing something that python.exe is not, but I am not sure what. Any suggestions?

cheers
patrick
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phtj
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I came back to this problem recently - and I am still having the same problem. (I am using windows). If I start /python/bin/python2.5.exe, and do:

>>> import sys, os
>>> sys.path.append(os.environ+“/houdini/scripts/python”)
>>> import hou

At first it looks like it works. But then anything I do after that gives an invalid syntax error.

>>> hou
File “<stdin>”, line 1
hou
^
SyntaxError: invalid syntax


Is this a bug on windows?
Patrick
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edward
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This has been fixed for the next major release of Houdini. The current workarounds are:
- Use hython
- Or, avoid using python interactively.
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kursad
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Hi

“ImportError: DLL load failed: %1 is not a valid Win32 application.”

Is this error related to issue that is mentioned here? I have been trying to use interactive python session

thanks
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edward
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Your error seems to be similar to the first post of this thread. Using an interactive python to import hou will not currently work regardless.
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pelos
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i downloaded houdini apprentice 12.5 64bits with vc9
and i am trying to make a small script outside houdini
i got the python versión from here.
http://www.python.org/download/releases/2.6.8/ [python.org]

but not sure what the vc9 suppost to be .
do i need to download another versión of python?

thanks guys.
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NicTanghe
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Hello I`m here to report I`ve tried some the internet solutions and none of them seem to work.
Anny advice is welcome.

Im on Linux with vscode. Below are some of my settings.



( i also have the problem that the tmp.py files aren`t actually linked)

    "python.autoComplete.extraPaths": ["/opt/hfs19.5/python/lib"],
    "python.autoComplete.preloadModules": ["hou"],
    "terminal.integrated.env.linux": {
        "PYTHONPATH" : "/opt/hfs19.5/houdini/python/lib"},
    "python.analysis.extraPaths": [
        "/opt/hfs19.5/python/lib"
    ],
Edited by NicTanghe - Sept. 5, 2023 03:58:28
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jjayakumar
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NicTanghe
Hello I`m here to report I`ve tried some the internet solutions and none of them seem to work.
Anny advice is welcome.

Im on Linux with vscode. Below are some of my settings.



( i also have the problem that the tmp.py files aren`t actually linked)

    "python.autoComplete.extraPaths": ["/opt/hfs19.5/python/lib"],
    "python.autoComplete.preloadModules": ["hou"],
    "terminal.integrated.env.linux": {
        "PYTHONPATH" : "/opt/hfs19.5/houdini/python/lib"},
    "python.analysis.extraPaths": [
        "/opt/hfs19.5/python/lib"
    ],


Hi Nic,

It should be pointing to python3.9 libs instead. Try this

    "python.autoComplete.extraPaths": ["/opt/hfs19.5/houdini/python3.9libs"],
    "python.autoComplete.preloadModules": ["hou"],
    "terminal.integrated.env.linux": {
        "PYTHONPATH" : "/opt/hfs19.5/houdini/python3.9libs"},
    "python.analysis.extraPaths": [
        "/opt/hfs19.5/houdini/python3.9libs"
    ],


-J
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