code: def __init__(self, area):
      object.__init__(self)
      self.area = area
      self._container = None
      self._stretch = (10, 10)
      self.stretches = weakref.WeakKeyDictionary()
  
imports: import weakref
  from ..Qt import QtCore, QtWidgets
  from .Dock import Dock
label_desc: Use image node_id 1 to create a new Container object from inherited base classes: object with example: obj = Container(area)