c4d-change-layer-attributes.py

import c4d
from c4d import gui

# In this video let's talk how to create layers, 
# apply it to objects and change it attributes with Cinema 4D Python SDK.
# Check out tutorial here:
# https://mikeudin.net/?p=8680


def GetFirstLayer(doc):
    return doc.GetLayerObjectRoot().GetDown()

def main():

    # Get the first document layer
    fl = GetFirstLayer(doc)

    if not fl:
        gui.MessageDialog('No layers found!')
        return

    # Set layer data with Solo attribute, you can add any other attribute to the dict
    # like a {'solo':True, 'visible':True,'color':c4d.Vector(1,1,1)} 
    
    new_layer_data = {'solo':True}
    fl.SetLayerData(doc,new_layer_data)

    # This isn't documented near SetLayerData, but you must call this method or C4D won't know to update the
    # solo state of layers in the scene.
    
    doc.ChangeNBit(c4d.NBIT_SOLO_LAYER, c4d.NBITCONTROL_SET)

    # Let C4D know something has changed to trigger a redraw
    
    c4d.EventAdd()
    


if __name__=='__main__':
    c4d.CallCommand(13957) # Clear Console
    main()