code: def fix_code(code, directory):
      
      if not black:
          raise Fault("black not installed", code=400)
  
      try:
          if parse_version(black.__version__) < parse_version("19.0"):
              reformatted_source = black.format_file_contents(
                  src_contents=code, line_length=black.DEFAULT_LINE_LENGTH, fast=False
              )
          else:
              fm = black.FileMode()
              reformatted_source = black.format_file_contents(
                  src_contents=code, fast=False, mode=fm
              )
          return reformatted_source
      except black.NothingChanged:
          return code
      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.