old_contents: #!/usr/bin/env python
  from __future__ import print_function
  from __future__ import unicode_literals
  
  
  class Binheap(object):
      ''' Create an empty heap. '''
      def __init__(self, list=[]):
          self.list = list
  
new_contents: #!/usr/bin/env python
  from __future__ import print_function
  from __future__ import unicode_literals
  
  
  class Binheap(object):
      ''' Create an empty heap. '''
      def __init__(self, binlist=[]):
          self.binlist = binlist
  
      def push(self, value):
          self.binlist.append[value]
  
      
  
subject: add push method