code: def fix_code(code, directory):
      
      if not yapf_api:
          raise Fault('yapf not installed', code=400)
      style_config = file_resources.GetDefaultStyleForDir(directory or os.getcwd())
      try:
          reformatted_source, _ = yapf_api.FormatCode(code,
                                                      filename='<stdin>',
                                                      style_config=style_config,
                                                      verify=False)
          return reformatted_source
      except Exception as e:
              raise Fault("Error during formatting: {}".format(e),
                          code=400)
docs: Formats Python code to conform to the PEP 8 style guide.