# Buggy code
def main(self, args):
    options, args = self.parse_args(args)

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

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

    # TODO: Try to get these passing down from the command?
    #       without resorting to os.environ to hold these.
    #       This also affects isolated builds and it should.

    if options.no_input:
        os.environ["PIP_NO_INPUT"] = "1"

    if options.exists_action:
        os.environ["PIP_EXISTS_ACTION"] = " ".join(options.exists_action)

    if options.require_venv and not self.ignore_require_venv:
        # If a venv is required check if it can really be found
        if not running_under_virtualenv():
            logger.critical("Could not find an activated virtualenv (required).")
            sys.exit(VIRTUALENV_NOT_FOUND)

    try:
        status = self.run(options, args)
        # FIXME: all commands should return an exit status
        # and when it is done, isinstance is not needed anymore
        if isinstance(status, int):
            return status
    except PreviousBuildDirError as exc:
        logger.critical(str(exc))
        logger.debug("Exception information:", exc_info=True)

        return PREVIOUS_BUILD_DIR_ERROR
    except (InstallationError, UninstallationError, BadCommand) as exc:
        logger.critical(str(exc))
        logger.debug("Exception information:", exc_info=True)

        return ERROR
    except CommandError as exc:
        logger.critical("ERROR: %s", exc)
        logger.debug("Exception information:", exc_info=True)

        return ERROR
    except KeyboardInterrupt:
        logger.critical("Operation cancelled by user")
        logger.debug("Exception information:", exc_info=True)

        return ERROR
    except BaseException:
        logger.critical("Exception:", exc_info=True)

        return UNKNOWN_ERROR
    finally:
        # Check if we're using the latest version of pip available
        skip_version_check = options.disable_pip_version_check or getattr(
            options, "no_index", False
        )
        if not skip_version_check:
            session = self._build_session(
                options, retries=0, timeout=min(5, options.timeout)
            )
            with session:
                pip_version_check(session, options)

        # Shutdown the logging module
        logging.shutdown()

    return SUCCESS


# Traceback (TypeError)
pip install --no-cache-dir --verbose wheel
Config variable 'Py_DEBUG' is unset, Python ABI tag may be incorrect
Config variable 'WITH_PYMALLOC' is unset, Python ABI tag may be incorrect
Created temporary directory: C:\Users\User\AppData\Local\Temp\pip-ephem-wheel-cache-2e5wmnq3
Created temporary directory: C:\Users\User\AppData\Local\Temp\pip-req-tracker-gnigbooj
Created requirements tracker 'C:\\Users\\User\\AppData\\Local\\Temp\\pip-req-tracker-gnigbooj'
Created temporary directory: C:\Users\User\AppData\Local\Temp\pip-install-u77xlkpb
Requirement already satisfied: wheel in c:\users\user\prj\pip\venv\lib\site-packages (0.31.1)
Cleaning up...
Removed build tracker 'C:\\Users\\User\\AppData\\Local\\Temp\\pip-req-tracker-gnigbooj'
There was an error checking the latest version of pip
Traceback (most recent call last):
File "c:\users\user\prj\pip\src\pip\_internal\utils\outdated.py", line 90, in pip_version_check
state = SelfCheckState(cache_dir=options.cache_dir)
File "c:\users\user\prj\pip\src\pip\_internal\utils\outdated.py", line 25, in __init__
self.statefile_path = os.path.join(cache_dir, "selfcheck.json")
File "C:\Users\user\prj\pip\venv\lib\ntpath.py", line 76, in join
path = os.fspath(path)
TypeError: expected str, bytes or os.PathLike object, not bool

# Fixed code
def main(self, args):
    options, args = self.parse_args(args)

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

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

    # TODO: Try to get these passing down from the command?
    #       without resorting to os.environ to hold these.
    #       This also affects isolated builds and it should.

    if options.no_input:
        os.environ["PIP_NO_INPUT"] = "1"

    if options.exists_action:
        os.environ["PIP_EXISTS_ACTION"] = " ".join(options.exists_action)

    if options.require_venv and not self.ignore_require_venv:
        # If a venv is required check if it can really be found
        if not running_under_virtualenv():
            logger.critical("Could not find an activated virtualenv (required).")
            sys.exit(VIRTUALENV_NOT_FOUND)

    try:
        status = self.run(options, args)
        # FIXME: all commands should return an exit status
        # and when it is done, isinstance is not needed anymore
        if isinstance(status, int):
            return status
    except PreviousBuildDirError as exc:
        logger.critical(str(exc))
        logger.debug("Exception information:", exc_info=True)

        return PREVIOUS_BUILD_DIR_ERROR
    except (InstallationError, UninstallationError, BadCommand) as exc:
        logger.critical(str(exc))
        logger.debug("Exception information:", exc_info=True)

        return ERROR
    except CommandError as exc:
        logger.critical("ERROR: %s", exc)
        logger.debug("Exception information:", exc_info=True)

        return ERROR
    except KeyboardInterrupt:
        logger.critical("Operation cancelled by user")
        logger.debug("Exception information:", exc_info=True)

        return ERROR
    except BaseException:
        logger.critical("Exception:", exc_info=True)

        return UNKNOWN_ERROR
    finally:
        allow_version_check = (
            # Does this command have the index_group options?
            hasattr(options, "no_index")
            and
            # Is this command allowed to perform this check?
            not (options.disable_pip_version_check or options.no_index)
        )
        # Check if we're using the latest version of pip available
        if allow_version_check:
            session = self._build_session(
                options, retries=0, timeout=min(5, options.timeout)
            )
            with session:
                pip_version_check(session, options)

        # Shutdown the logging module
        logging.shutdown()

    return SUCCESS