code: def undo_block_start(self):
      if self.undoblock == 0:
          self.undoblock = CommandSequence()
      self.undoblock.bump_depth()
  
imports: import string
  from idlelib.delegator import Delegator
label_desc: Use image node_id 11 for calling the UndoDelegator obj's underlying member method code with example usage: obj.undo_block_start() without return types