Package "includes" functionality

[hughetop]

Some 3rd party DCCs come with their own python interpreter. I've made custom python packages for them that are basically just:

name = 'python'
version = '3.10.2.blender'
variants = [['platform-windows', 'arch-AMD64']]
def commands():
    import sys
    if sys.platform == 'win32':
        # this needs to double up on quotes because of spaces in directories
        alias('python', r'"C:\Program Files\Blender Foundation\Blender 3.1\3.1\python\bin\python.exe"')

and the blender package has requires = ['python-3.10.2.blender']. This makes it so that anything that uses blender will also have a python package of the correct version, and it means I don't have to locally install python-3.10 on every computer. It's been working well, I can use this package to rez-pip --install things like PySide2 and it builds the correct variant.

Interestingly, blender's python interpreter comes with a few extras, like requests and numpy. So the new feature request is some kind of "includes" where this custom python package can say "requests and numpy are included in this package" so that I don't have to make new variants for requests and numpy only for them to be ignored at runtime. I was hoping ephemerals could do this, but maybe I just don't understand how to use them.

[instinct-vfx]

Unless i am missing something i think this would be covered by the "provides" feature. See here: #673

[hughetop]

Interesting! Yes that looks like exactly what I'm looking for! I believe in the meantime I can create "fake" variants for requests and numpy for python-3.10.2.blender that are empty.

Edit: fake variants seems to work as long as I add something like:

def commands:
    if 'blender' not in this.root:
        env.PYTHONPATH.append('{root}/python')
        ...

[herronelou]

I'm having similar issues with Nuke, keeping an eye on #1100, it's clashing all the way down with the typing module and it's not pretty :)

[JeanChristopheMorinPerso]

If I'm not mistaken, the typing module issue in Nuke can be fixed and it doesn't require the provides feature. You can probably ask in the #wg-python3 AWS slack channel.

[herronelou]

I did some other workaround with the commands of the typing packages so that if nuke <13 is included it uses a shim that points back at Nuke's (well, shiboken's) typing module. Maybe provides wouldn't have solved it in this case because the built-in one is called typing27. Still, I have plenty of other cases, mostly around Qt, where provides would make my life a whole lot easier.