old_contents: import bin_heap as bh
  
  
  class Priority(object):
      """docstring for priority"""
      def __init__(self):
          self.bin_heap = bh
  
      def insert(self, item, rank):
          bh.push(item, rank)
  
      def pop(self):
          item = self.bin_heap.pop()
          return item
  
      def peek(self, item):
          return item
  
new_contents: import bin_heap as bh
  
  
  class Priority(object):
      """docstring for priority"""
      def __init__(self):
          self.bin_heap = bh()
  
      def insert(self, item, rank):
          bh.push(item, rank)
  
      def pop(self):
          item = self.bin_heap.pop()
          return item
  
      def peek(self, item):
          return item
  
subject: Fix typo; bin_heap will now properly instate