input: Write a function to implement a Python class named StringComparator that receives two strings and has methods for determining if the strings are equal, different, or similar up to a provided threshold. If the function returns equal, different, or similar, it should return True; otherwise, it should return False.
  
  class StringComparator:
  
   def __init__(self, string1, string2):
       self.string1 = string1
       self.string2 = string2
  
   def is_equal(self):
       return self.string1 == self.string2
  
   def is_different(self):
       return self.string1 != self.string2
  
   def is_similar(self, threshold=0.5):
       distance = edit_distance(self.string1, self.string2)
       max_length = max(len(self.string1), len(self.string2))
  
       return distance / max_length < threshold
  
  # Test cases
  comparator1 = StringComparator("hello", "hello")
  assert comparator1.is_equal() == True
  assert comparator1.is_different() == False
  assert comparator1.is_similar(threshold=0.5) == True
  
  comparator2 = StringComparator("hello", "world")
  assert comparator2.is_equal() == False
  assert comparator2.is_different() == True
  assert comparator2.is_similar(threshold=0.5) == False
  
  comparator3 = StringComparator("kitten", "sitting")
  assert comparator3.is_equal() == False
  assert comparator3.is_different() == True
  assert comparator3.is_similar(threshold=0.5) == True
output: 
  def __init__(self, string1, string2):
      self.string1 = string1
      self.string2 = string2
  
  def is_equal(self):
      return self.string1 == self.string2
  
  def is_different(self):
      return self.string1 != self.string2
  
  def is_similar(self, threshold=0.5):
      distance = edit_distance(self.string1, self.string2)
      max_length = max(len(self.string1), len(self.string2))
      return distance / max_length < threshold
  