code: def __call__(self, parser, namespace, values, option_string=None):
      overrides = {}
      for item in values:
          try:
              k, v = item.split("=", 1)
          except ValueError:
              raise ValueError(
                  "Extra settings must be specified as KEY=VALUE pairs "
                  f"but you specified {item}"
              )
          try:
              overrides[k] = json.loads(v)
          except json.decoder.JSONDecodeError:
              raise ValueError(
                  f"Invalid JSON value: {v}. "
                  "Values specified via -e / --extra-settings flags "
                  "must be in JSON notation. "
                  "Use -e KEY='\"string\"' to specify a string value; "
                  "-e KEY=null to specify None; "
                  "-e KEY=false (or true) to specify False (or True)."
              )
      setattr(namespace, self.dest, overrides)
  
imports: import argparse
  import importlib.metadata
  import json
  import logging
  import multiprocessing
  import os
  import pprint
  import sys
  import time
  import traceback
  from collections.abc import Iterable
  from pkgutil import extend_path
  from pelican.log import console
  from pelican.log import init
  from pelican.generators import ArticlesGenerator, PagesGenerator, SourceFileGenerator, StaticGenerator, TemplatePagesGenerator
  from pelican.plugins import signals
  from pelican.plugins._utils import get_plugin_name, load_plugins
  from pelican.readers import Readers
  from pelican.server import ComplexHTTPRequestHandler, RootedHTTPServer
  from pelican.settings import read_settings
  from pelican.utils import clean_output_dir, maybe_pluralize, wait_for_changes
  from pelican.writers import Writer
label_desc: Use image node_id 1 for calling the ParseOverrides obj's underlying member method code with example usage: obj.__call__(parser, namespace, values, option_string) without return types