code: def containerChanged(self, c):
      self._container = c
      if c is None:
          self.area = None
      else:
          self.area = c.area
  
imports: import weakref
  from ..Qt import QtCore, QtWidgets
  from .Dock import Dock
label_desc: Use image node_id 3 for calling the Container obj's underlying member method code with example usage: obj.containerChanged(c) without return types