How to use the glances.plugins.glances_plugin.GlancesPlugin function in Glances

    @GlancesPlugin._log_result_decorator
    def update(self):
        """Update the foldered list."""
        # Init new stats
        stats = self.get_init_value()

        if self.input_method == 'local':
            # Folder list only available in a full Glances environment
            # Check if the glances_folder instance is init
            if self.glances_folders is None:
                return self.stats

            # Update the foldered list (result of command)
            self.glances_folders.update()

            # Put it on the stats var
            stats = self.glances_folders.get()

    @GlancesPlugin._check_decorator
    @GlancesPlugin._log_result_decorator
    def update(self):
        """Update CPU stats using the input method."""

        # Grab stats into self.stats
        if self.input_method == 'local':
            stats = self.update_local()
        elif self.input_method == 'snmp':
            stats = self.update_snmp()
        else:
            stats = self.get_init_value()

        # Update the stats
        self.stats = stats

        return self.stats

#
# Glances is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see .

"""psutil plugin."""

from glances import psutil_version_info
from glances.plugins.glances_plugin import GlancesPlugin


class Plugin(GlancesPlugin):
    """Get the psutil version for client/server purposes.

    stats is a tuple
    """

    def __init__(self, args=None, config=None):
        """Init the plugin."""
        super(Plugin, self).__init__(args=args, config=config)

        self.reset()

    def reset(self):
        """Reset/init the stats."""
        self.stats = None

    @GlancesPlugin._check_decorator

    @GlancesPlugin._log_result_decorator
    def update(self):
        """Update Wifi stats using the input method.

        Stats is a list of dict (one dict per hotspot)

        :returns: list -- Stats is a list of dict (hotspot)
        """
        # Init new stats
        stats = self.get_init_value()

        # Exist if we can not grab the stats
        if import_error_tag:
            return stats

        if self.input_method == 'local':
            # Update stats using the standard system lib

try:
    from wifi.scan import Cell
    from wifi.exceptions import InterfaceError
except ImportError as e:
    import_error_tag = True
    logger.warning("Missing Python Lib ({}), Wifi plugin is disabled".format(e))
else:
    import_error_tag = False

# Python 3 is not supported (see issue #1377)
if PY3:
    import_error_tag = True
    logger.warning("Wifi lib is not compliant with Python 3, Wifi plugin is disabled")


class Plugin(GlancesPlugin):
    """Glances Wifi plugin.

    Get stats of the current Wifi hotspots.
    """

    def __init__(self, args=None, config=None):
        """Init the plugin."""
        super(Plugin, self).__init__(args=args,
                                     config=config,
                                     stats_init_value=[])

        # We want to display the stat in the curse interface
        self.display_curse = True

    def get_key(self):
        """Return the key of the list.

'netapp': {'system': '1.3.6.1.4.1.789.1.2.1.3.0',
                       'idle': '1.3.6.1.4.1.789.1.2.1.5.0',
                       'nb_log_core': '1.3.6.1.4.1.789.1.2.1.6.0'}}

# Define the history items list
# - 'name' define the stat identifier
# - 'y_unit' define the Y label
items_history_list = [{'name': 'user',
                       'description': 'User CPU usage',
                       'y_unit': '%'},
                      {'name': 'system',
                       'description': 'System CPU usage',
                       'y_unit': '%'}]


class Plugin(GlancesPlugin):
    """Glances CPU plugin.

    'stats' is a dictionary that contains the system-wide CPU utilization as a
    percentage.
    """

    def __init__(self, args=None, config=None):
        """Init the CPU plugin."""
        super(Plugin, self).__init__(args=args,
                                     config=config,
                                     items_history_list=items_history_list)

        # We want to display the stat in the curse interface
        self.display_curse = True

        # Call CorePlugin in order to display the core number

except ImportError:
    logger.debug("batinfo library not found. Fallback to psutil.")
    batinfo_tag = False

# Availability:
# Linux, Windows, FreeBSD (psutil>=5.1.0)
# macOS (psutil>=5.4.2)
psutil_tag = True
try:
    psutil.sensors_battery()
except Exception as e:
    logger.error("Cannot grab battery status {}.".format(e))
    psutil_tag = False


class Plugin(GlancesPlugin):
    """Glances battery capacity plugin.

    stats is a list
    """

    def __init__(self, args=None, config=None):
        """Init the plugin."""
        super(Plugin, self).__init__(args=args,
                                     config=config,
                                     stats_init_value=[])

        # Init the sensor class
        self.glancesgrabbat = GlancesGrabBat()

        # We do not want to display the stat in a dedicated area
        # The HDD temp is displayed within the sensors plugin

# All items in this list will be historised if the --enable-history tag is set
items_history_list = [{'name': 'cpu',
                       'description': 'CPU percent usage',
                       'y_unit': '%'},
                      {'name': 'percpu',
                       'description': 'PERCPU percent usage',
                       'y_unit': '%'},
                      {'name': 'mem',
                       'description': 'MEM percent usage',
                       'y_unit': '%'},
                      {'name': 'swap',
                       'description': 'SWAP percent usage',
                       'y_unit': '%'}]


class Plugin(GlancesPlugin):
    """Glances quicklook plugin.

    'stats' is a dictionary.
    """

    def __init__(self, args=None, config=None):
        """Init the quicklook plugin."""
        super(Plugin, self).__init__(args=args,
                                     config=config,
                                     items_history_list=items_history_list)
        # We want to display the stat in the curse interface
        self.display_curse = True

    @GlancesPlugin._check_decorator
    @GlancesPlugin._log_result_decorator
    def update(self):