Global variable using python

[defc0n1]

Hi guys

Can you set global variables using python within an HDA? I have an ordered menu that is being populated by a python menu script. Is it possible to set a global variable from in there?

Thanks!

[lukeiamyourfather]

Never tried it but it should work. After creating the variable call global like this.

foo = 25
global foo

 

[defc0n1]

7 minutes ago, lukeiamyourfather said:

Never tried it but it should work. After creating the variable call global like this.

foo = 25
global foo

 

Hi Luke

Doesn't seem to work - SyntaxWarning: name 'foo' is assigned to before global declaration

[Atom]

Try fetching the global from within a def.

foo = 25

def multFoo(passedMult):
    global foo
    return foo * passedMult

 

Edited July 31, 2017 by Atom

[f1480187]

Depends on what are you trying to achieve.

1. If you wanted to store something per node , with the possibility to keep the info in the hip file.

2. hou.session module, where you can store and share Python objects within the current session of Houdini.

3. HOM shortcuts to modify the current environment variables: hou.getenv(), hou.putenv() and hou.unsetenv()
It will be available for use in parameters as $MYVARNAME until you close Houdini. It will not appear in the Aliases and Variables window, however.

4. If you really want to modify HDA definition globally, you can add a Section and save definition after that.
It will be available in the Extra Files tab of the Operator Type Properties window.

[defc0n1]

21 hours ago, f1480187 said:

Depends on what are you trying to achieve.

1. If you wanted to store something per node , with the possibility to keep the info in the hip file.

2. hou.session module, where you can store and share Python objects within the current session of Houdini.

3. HOM shortcuts to modify the current environment variables: hou.getenv(), hou.putenv() and hou.unsetenv()
It will be available for use in parameters as $MYVARNAME until you close Houdini. It will not appear in the Aliases and Variables window, however.

4. If you really want to modify HDA definition globally, you can add a Section and save definition after that.
It will be available in the Extra Files tab of the Operator Type Properties window.

Thanks for the help guys. I managed to do what I wanted by just passing around some detail attributes. Seemed much simpler!

[georgemacin]

Check this simple example...python global variable