old_contents: class SimpleNumber:
  
      def __init__(self, num):
          try:
              val = float(num)
          except ValueError:
              print("That's not a float number!")
          
          self.x = num
    
      def add(self, y):
          result = self.x + y
  
          return result
  
      def multiply(self, y):
          result = self.x * y
  
          return result
  
new_contents: class SimpleNumber:
  
      def __init__(self, num):
          try:
              val = float(num)
          except ValueError:
              print("That's not a float number!")
          
          self.x = num
    
      def add(self, y):
          result = self.x * y
  
          return result
  
      def multiply(self, y):
          result = self.x * y
  
          return result
  
subject: make operation error