code: def get_introspection_data(cls, tax_benefit_system):
          
          comments = inspect.getcomments(cls)
  
          # Handle dynamically generated variable classes or Jupyter Notebooks, which have no source.
          try:
              absolute_file_path = inspect.getsourcefile(cls)
          except TypeError:
              source_file_path = None
          else:
              source_file_path = absolute_file_path.replace(tax_benefit_system.get_package_metadata()['location'], '')
          try:
              source_lines, start_line_number = inspect.getsourcelines(cls)
              source_code = textwrap.dedent(''.join(source_lines))
          except (IOError, TypeError):
              source_code, start_line_number = None, None
  
          return comments, source_file_path, source_code, start_line_number
docs: Get instrospection data about the code of the variable.
  
          :returns: (comments, source file path, source code, start line number)
          :rtype: tuple