Repository: pypa/pip
File: src/pip/_internal/cli/base_command.py (Python)

Code before:
        return self.parser.parse_args(args)

    def main(self, args: list[str]) -> int:
        try:
            with self.main_context():
                return self._main(args)
        finally:
            logging.shutdown()

    def _main(self, args: list[str]) -> int:
        # We must initialize this before the tempdir manager, otherwise the
        # configuration would not be accessible by the time we clean up the
        # tempdir manager.
        self.tempdir_registry = self.enter_context(tempdir_registry())
        # Intentionally set as early as possible so globally-managed temporary
        # directories are available to the rest of the code.
        self.enter_context(global_tempdir_manager())

        options, args = self.parse_args(args)

        # Set verbosity so that it can be used elsewhere.
        self.verbosity = options.verbose - options.quiet
        if options.debug_mode:
            self.verbosity = 2

        reconfigure(no_color=options.no_color)
        level_number = setup_logging(
            verbosity=self.verbosity,
            no_color=options.no_color,
            user_log_file=options.log,
        )

        always_enabled_features = set(options.features_enabled) & set(
            cmdoptions.ALWAYS_ENABLED_FEATURES
        )
        if always_enabled_features:
            logger.warning(
                "The following features are always enabled: %s. ",
                ", ".join(sorted(always_enabled_features)),
            )

        # Make sure that the --python argument isn't specified after the
        # subcommand. We can tell, because if --python was specified,
        # we should only reach this point if we're running in the created
        # subprocess, which has the _PIP_RUNNING_IN_SUBPROCESS environment
        # variable set.
        if options.python and "_PIP_RUNNING_IN_SUBPROCESS" not in os.environ:
            logger.critical(
                "The --python option must be placed before the pip subcommand name"
            )
            sys.exit(ERROR)

Review comment (suggestion):
Does a hasattr check really need to be done here or is this to guard against some type hinter / IDE warning? I don't have a good grasp on the options object, so this is a genuine question.

Code after:
        return self.parser.parse_args(args)

    def main(self, args: list[str]) -> int:
        try:
            with self.main_context():
                return self._main(args)
        finally:
            logging.shutdown()

    def _main(self, args: list[str]) -> int:
        # We must initialize this before the tempdir manager, otherwise the
        # configuration would not be accessible by the time we clean up the
        # tempdir manager.
        self.tempdir_registry = self.enter_context(tempdir_registry())
        # Intentionally set as early as possible so globally-managed temporary
        # directories are available to the rest of the code.
        self.enter_context(global_tempdir_manager())

        options, args = self.parse_args(args)

        # Set verbosity so that it can be used elsewhere.
        self.verbosity = options.verbose - options.quiet
        if options.debug_mode:
            self.verbosity = 2

        if hasattr(options, "progress_bar") and options.progress_bar == "auto":
            options.progress_bar = "on" if self.verbosity >= 0 else "off"

        reconfigure(no_color=options.no_color)
        level_number = setup_logging(
            verbosity=self.verbosity,
            no_color=options.no_color,
            user_log_file=options.log,
        )

        always_enabled_features = set(options.features_enabled) & set(
            cmdoptions.ALWAYS_ENABLED_FEATURES
        )
        if always_enabled_features:
            logger.warning(
                "The following features are always enabled: %s. ",
                ", ".join(sorted(always_enabled_features)),
            )

        # Make sure that the --python argument isn't specified after the
        # subcommand. We can tell, because if --python was specified,
        # we should only reach this point if we're running in the created
        # subprocess, which has the _PIP_RUNNING_IN_SUBPROCESS environment
        # variable set.
        if options.python and "_PIP_RUNNING_IN_SUBPROCESS" not in os.environ:
            logger.critical(