How to use the jupyterlab.jupyterlab.labextensions.BaseExtensionApp function in jupyterlab

description = "Enable labextension(s) by name"

    def run_task(self):
        [enable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class DisableLabExtensionsApp(BaseExtensionApp):
    description = "Disable labextension(s) by name"

    def run_task(self):
        [disable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class CheckLabExtensionsApp(BaseExtensionApp):
    description = "Check labextension(s) by name"
    flags = check_flags

    should_check_installed_only = Bool(False, config=True,
        help="Whether it should check only if the extensions is installed")

    def run_task(self):
        all_enabled = all(
            check_extension(
                arg, self.app_dir,
                self.should_check_installed_only,
                logger=self.log)
            for arg in self.extra_args)
        if not all_enabled:
            exit(1)

msg = traceback.format_exception(ex.__class__, ex, exc_traceback)
            for line in msg:
                self.log.debug(line)
            self.log.error('\nErrored, use --debug for full output:')
            self.log.error(msg[-1].strip())
            sys.exit(1)

    def run_task(self):
        pass

    def _log_format_default(self):
        """A default format for messages"""
        return "%(message)s"


class InstallLabExtensionApp(BaseExtensionApp):
    description = "Install labextension(s)"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            install_extension(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class UpdateLabExtensionApp(BaseExtensionApp):
    description = "Update labextension(s)"
    flags = update_flags

    all = Bool(False, config=True,
        help="Whether to update all extensions")

for arg in self.extra_args
        ])


class UninstallLabExtensionApp(BaseExtensionApp):
    description = "Uninstall labextension(s) by name"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            uninstall_extension(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class ListLabExtensionsApp(BaseExtensionApp):
    description = "List the installed labextensions"

    def run_task(self):
        list_extensions(self.app_dir, logger=self.log)


class EnableLabExtensionsApp(BaseExtensionApp):
    description = "Enable labextension(s) by name"

    def run_task(self):
        [enable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class DisableLabExtensionsApp(BaseExtensionApp):
    description = "Disable labextension(s) by name"

all = Bool(False, config=True,
        help="Whether to update all extensions")

    def run_task(self):
        if not self.all and not self.extra_args:
            self.log.warn('Specify an extension to update, or use --all to update all extensions')
            return False
        if self.all:
            return update_extension(all_=True, app_dir=self.app_dir, logger=self.log)
        return any([
            update_extension(name=arg, app_dir=self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class LinkLabExtensionApp(BaseExtensionApp):
    description = """
    Link local npm packages that are not lab extensions.

    Links a package to the JupyterLab build process. A linked
    package is manually re-installed from its source location when
    `jupyter lab build` is run.
    """
    should_build = Bool(True, config=True,
        help="Whether to build the app after the action")

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            link_package(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])

for arg in self.extra_args
        ])


class UnlinkLabExtensionApp(BaseExtensionApp):
    description = "Unlink packages by name or path"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            unlink_package(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class UninstallLabExtensionApp(BaseExtensionApp):
    description = "Uninstall labextension(s) by name"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            uninstall_extension(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class ListLabExtensionsApp(BaseExtensionApp):
    description = "List the installed labextensions"

    def run_task(self):
        list_extensions(self.app_dir, logger=self.log)

def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            uninstall_extension(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class ListLabExtensionsApp(BaseExtensionApp):
    description = "List the installed labextensions"

    def run_task(self):
        list_extensions(self.app_dir, logger=self.log)


class EnableLabExtensionsApp(BaseExtensionApp):
    description = "Enable labextension(s) by name"

    def run_task(self):
        [enable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class DisableLabExtensionsApp(BaseExtensionApp):
    description = "Disable labextension(s) by name"

    def run_task(self):
        [disable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class CheckLabExtensionsApp(BaseExtensionApp):

Links a package to the JupyterLab build process. A linked
    package is manually re-installed from its source location when
    `jupyter lab build` is run.
    """
    should_build = Bool(True, config=True,
        help="Whether to build the app after the action")

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            link_package(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class UnlinkLabExtensionApp(BaseExtensionApp):
    description = "Unlink packages by name or path"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            unlink_package(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class UninstallLabExtensionApp(BaseExtensionApp):
    description = "Uninstall labextension(s) by name"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([

"""A default format for messages"""
        return "%(message)s"


class InstallLabExtensionApp(BaseExtensionApp):
    description = "Install labextension(s)"

    def run_task(self):
        self.extra_args = self.extra_args or [os.getcwd()]
        return any([
            install_extension(arg, self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])


class UpdateLabExtensionApp(BaseExtensionApp):
    description = "Update labextension(s)"
    flags = update_flags

    all = Bool(False, config=True,
        help="Whether to update all extensions")

    def run_task(self):
        if not self.all and not self.extra_args:
            self.log.warn('Specify an extension to update, or use --all to update all extensions')
            return False
        if self.all:
            return update_extension(all_=True, app_dir=self.app_dir, logger=self.log)
        return any([
            update_extension(name=arg, app_dir=self.app_dir, logger=self.log)
            for arg in self.extra_args
        ])

class ListLabExtensionsApp(BaseExtensionApp):
    description = "List the installed labextensions"

    def run_task(self):
        list_extensions(self.app_dir, logger=self.log)


class EnableLabExtensionsApp(BaseExtensionApp):
    description = "Enable labextension(s) by name"

    def run_task(self):
        [enable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class DisableLabExtensionsApp(BaseExtensionApp):
    description = "Disable labextension(s) by name"

    def run_task(self):
        [disable_extension(arg, self.app_dir, logger=self.log)
         for arg in self.extra_args]


class CheckLabExtensionsApp(BaseExtensionApp):
    description = "Check labextension(s) by name"
    flags = check_flags

    should_check_installed_only = Bool(False, config=True,
        help="Whether it should check only if the extensions is installed")

    def run_task(self):
        all_enabled = all(