new_contents: def cmp_to_key(mycmp):
      """
      Convert `sorted` function from python2 to python3.
  
      This function is used to convert `cmp` parameter of python2 sorted
      function into `key` parameter of python3 sorted function.
  
      This code is taken from here:
      https://docs.python.org/2/howto/sorting.html#the-old-way-using-the-cmp-parameter
  
      :param mycmp: compare function that compares 2 values
      :return: key class that compares 2 values
      """
      "Convert a cmp= function into a key= function"
      class K(object):
          def __init__(self, obj, *args):
              self.obj = obj
  
          def __lt__(self, other):
              return mycmp(self.obj, other.obj) < 0
  
          def __gt__(self, other):
              return mycmp(self.obj, other.obj) > 0
  
          def __eq__(self, other):
              return mycmp(self.obj, other.obj) == 0
  
          def __le__(self, other):
              return mycmp(self.obj, other.obj) <= 0
  
          def __ge__(self, other):
              return mycmp(self.obj, other.obj) >= 0
  
          def __ne__(self, other):
              return mycmp(self.obj, other.obj) != 0
      return K
  
  
subject: Add utilities to convert from python2 to python3.