old_contents: # -*- coding: utf-8 -*-
  
  
  class Heap(object):
    """Implements a heap data structure in Python.
  
    The underlying data structure used to hold the data is a list.
    """
  
    _heap = []
  
    def __init__(self, initial=None):
      """Creates a new heap.
  
      Args:
        initial: (Optional): A continguous list containing the data with which to
          initialize the new heap.
      """
      if isinstance(initial, list) or isinstance(initial, tuple):
        self._heap = initial
      elif initial is not None:
        raise TypeError(
          'Illegal type submitted for heap data; use a list or tuple instead.')
  
    def __unicode__(self):
      if not self._heap:
        return 'Empty'
      return 'Root: %s' % self.__heap[0]
  
new_contents: # -*- coding: utf-8 -*-
  
  
  class Heap(object):
    """Implements a heap data structure in Python.
  
    The underlying data structure used to hold the data is a list.
    """
  
    __heap = []
  
    def __init__(self, initial=None):
      """Creates a new heap.
  
      Args:
        initial: (Optional): A continguous list containing the data with which to
          initialize the new heap.
      """
      if isinstance(initial, list) or isinstance(initial, tuple):
        self.__heap = initial
      elif initial is not None:
        raise TypeError(
          'Illegal type submitted for heap data; use a list or tuple instead.')
  
    def __unicode__(self):
      if not self.__heap:
        return 'Empty'
      return 'Root: %s' % self.__heap[0]
  
subject: Revert "remove name mangling to make testing easier"