docs: def _register_pyflakes_check():
      """Register the pyFlakes checker into PEP8 set of checks."""
      from flake8_isort import Flake8Isort
      from flake8_blind_except import check_blind_except
  
      # Resolving conflicts between pep8 and pyflakes.
      codes = {
          "UnusedImport": "F401",
          "ImportShadowedByLoopVar": "F402",
          "ImportStarUsed": "F403",
          "LateFutureImport": "F404",
          "Redefined": "F801",
          "RedefinedInListComp": "F812",
          "UndefinedName": "F821",
          "UndefinedExport": "F822",
          "UndefinedLocal": "F823",
          "DuplicateArgument": "F831",
          "UnusedVariable": "F841",
      }
  
      for name, obj in vars(pyflakes.messages).items():
          if name[0].isupper() and obj.message:
              obj.tpl = "{0} {1}".format(codes.get(name, "F999"), obj.message)
  
      pep8.register_check(_PyFlakesChecker, codes=['F'])
      # FIXME parser hack
      parser = pep8.get_parser('', '')
      Flake8Isort.add_options(parser)
      options, args = parser.parse_args([])
      # end of hack
      pep8.register_check(Flake8Isort, codes=['I'])
      pep8.register_check(check_blind_except, codes=['B90'])