old_contents: #!/bin/env python
  
  
  class Core(object):
      """A simple script to get Security Hash Algorithms into JSON format"""
  
      def __init__(self, path):
          self.path = path
  
new_contents: #!/bin/env python
  
  
  class Core(object):
      """A simple script to get Security Hash Algorithms into JSON format"""
  
      def __init__(self, path, algorithm='sha512'):
          self.path = path
          self.algorithm = algorithm
  
subject: add algorith to argument of Core() into core.py