note that you can still set rna properties like this. bpy.data.__dict__["var"] = 1 print(bpy.data.var) but this is only stored for the python objects lifetime and not actually attached to blenders data
note that you can still set rna properties like this. bpy.data.__dict__["var"] = 1 print(bpy.data.var) but this is only stored for the python objects lifetime and not actually attached to blenders data