code: def parse_equality(cls, equality_string):
          
          cls.register()
          assert '=' in equality_string, "There must be an '=' sign in the equality"
          [left_side, right_side] = equality_string.split('=', 1)
  
          left_side_value = yaml.safe_load(left_side.strip())
          right_side_value = yaml.safe_load(right_side.strip())
  
          assert isinstance(left_side_value, str), "Left side of equality must be a string"
  
          return left_side_value, right_side_value
docs: Parse some simple equality statements