code: def should_update(stack):
      
      if stack.locked:
          if not stack.force:
              logger.debug("Stack %s locked and not in --force list. "
                           "Refusing to update.", stack.name)
              return False
          else:
              logger.debug("Stack %s locked, but is in --force "
                           "list.", stack.name)
      return True
docs: Tests whether a stack should be submitted for updates to CF.
  
      Args:
          stack (:class:`stacker.stack.Stack`): The stack object to check.
  
      Returns:
          bool: If the stack should be updated, return True.