Getting Houdini Global Vars With Python

[lisux]

Hi houdiniks

I want to get some global vars from my Houdini session in a python script.

I can use hscript into python with for example:

hou.hscript("echo $JOB")[0][:-1]

But I guess there are something in the HOM API to get the environment variables of the current session.

Somebody can drop some light on this?

Thanks

[Jason]

Hi houdiniks

I want to get some global vars from my Houdini session in a python script.

I can use hscript into python with for example:

hou.hscript("echo $JOB")[0][:-1]

But I guess there are something in the HOM API to get the environment variables of the current session.

Somebody can drop some light on this?

Thanks

Nope, those HOM functions have not been implemented, I'm afraid (I've asked for them a few times myself). You're stuck with running hscript commands from HOM right now. Try running "set" without args to get the full list. Unfortunately you get user variables (like $MYVAR) alongside the special variables like ($F).

[lisux]

Nope, those HOM functions have not been implemented, I'm afraid (I've asked for them a few times myself). You're stuck with running hscript commands from HOM right now. Try running "set" without args to get the full list. Unfortunately you get user variables (like $MYVAR) alongside the special variables like ($F).

A pity, I think that is very logical to have a dictionary for all the environment variables defined into the hou object.

And even worse, using hou.hscript() from the python shell sometimes freezes or creates some refreshing problems to the panel

[symek]

Use hou.hscriptExpression instead to have a clear variable:

>> print hou.hscriptExpression("$HIPNAME")
'untilted.hip'
>>

cheers,

sy.

Edited December 28, 2007 by SYmek

[lisux]

Use hou.hscriptExpression instead to have a clear variable:

>> print hou.hscriptExpression("$HIPNAME")
'untilted.hip'
>>

cheers,

sy.

Thanks symek, more clear and better

[Jason]

If you chorus with us and ask on SESI's site for the HOM variable functions to be added, perhaps they'll prioritize it for development sooner rather than later.

Nice tip, syMEK.

[graham]

The slightly differenty way is to use

hou.expandString('$HIPNAME')

Also, if you only need system environment variables you can also use things like os.environ to get a dictionary of them.

import os

os.environ['HIP']

Not quite the same thing but I just thought I'd throw it in.

[LaidlawFX]

For those that the internet has brought them back to this thread SideFX did implement this at some point.

hou.getenv
http://www.sidefx.com/docs/houdini/hom/hou/getenv
hou.putenv()
http://www.sidefx.com/docs/houdini/hom/hou/putenv.html
hou.unsetenv()
http://www.sidefx.com/docs/houdini/hom/hou/unsetenv.html

[galagast]

Hi, apologies for resurrecting this.
The current functions does allow me to grab the Houdini Global Variables.
But is there a way to get a list of these?

os.environ works, but I'm only after the Houdini Global Variables currently in my scene >_<

[fxartist420]

On 9/5/2020 at 5:46 AM, galagast said:

Hi, apologies for resurrecting this.
The current functions does allow me to grab the Houdini Global Variables.
But is there a way to get a list of these?

os.environ works, but I'm only after the Houdini Global Variables currently in my scene >_<

Hey Jeff!

Did you find a solution for this?? I'm trying to do the same and got stuck.

[Stalkerx777]

I don't think there's a way to get the list of hip variables. A quick and dirty solution that comes in mind is parsing the text block of the hip file. In shell it would be:

 

strings scene.hip | grep 'set -g'

 

Same can be done from within Houdini with Python given the hip has been saved:

 

import re

with open(hou.hipFile.path(), 'rb') as f:
  for var, val in re.findall(r".*set -g (.+?)\s=\s\'(.*)\'", f.read()):
    print(var, val)
  

 

Edited May 3, 2021 by Stalkerx777
formatting

[symek]

3 hours ago, Stalkerx777 said:

Same can be done from within Houdini with Python given the hip has been saved

or just

 hou.hscript("setenv -s")

and since we are not valetudinarians :

cpio &> /dev/null -D /tmp/ -i < scene.hip && fgrep "set -g" /tmp/.variables

hehe.

[Stalkerx777]

17 hours ago, symek said:

or just

 hou.hscript("setenv -s")

and since we are not valetudinarians :

cpio &> /dev/null -D /tmp/ -i < scene.hip && fgrep "set -g" /tmp/.variables

hehe.

Aaha, nice!