Short description of error
Adding
from __future__ import annotations
at the top of a python file makes the properties annotations of operators non-existent.
This will be enabled by default in Python 4.0, see: https://www.python.org/dev/peps/pep-0563
Exact steps for others to reproduce the error
Create and enable this simple demo addon:
from __future__ import annotations # this line makes the line 30 throw an error, because the property some_prop of BUGANNOTATIONS_OT_some_op will no longer exist
bl_info = {
'name': 'Bug annotations with __future__',
'author': 'Arnold, Arnaud Couturier, piiichan (couturier.arnaud@gmail.com)',
'version': (1, 0, 0),
'blender': (2, 80, 0),
'location': 'scene options',
'category': 'Scene',
}
import bpy
class BUGANNOTATIONS_OT_some_op(bpy.types.Operator):
bl_idname = 'scene.hey'
bl_label = 'An operator'
some_prop: bpy.props.StringProperty(name='Hello', default='Default value')
class BUGANNOTATIONS_PT_some_panel(bpy.types.Panel):
bl_region_type = 'WINDOW'
bl_space_type = 'PROPERTIES'
bl_context = 'scene'
bl_options = {'DEFAULT_CLOSED'}
bl_label = 'Bug annotations'
def draw(self, context):
op = self.layout.operator(BUGANNOTATIONS_OT_some_op.bl_idname)
print(op.some_prop)
def register():
bpy.utils.register_class(BUGANNOTATIONS_OT_some_op)
bpy.utils.register_class(BUGANNOTATIONS_PT_some_panel)
def unregister():
bpy.utils.unregister_class(BUGANNOTATIONS_PT_some_panel)
bpy.utils.unregister_class(BUGANNOTATIONS_OT_some_op)then go in the scene settings, a new panel appears. Show the button inside, and look into the console, you'll see that some_prop from the operator doesn't exist if future is imported.