code: def get_page_no_arg(self) -> int:
      p_no = self.get_query_argument("p_no", "")
      if len(p_no) == 0:
          p_no = str(DEFAULT_PAGE_NO)
      return int(p_no)
  
imports: import os
  import os.path
  import argparse
  from typing import List
  from vizseq._utils.logger import logger
  from vizseq._view import VizSeqWebView, DEFAULT_PAGE_SIZE, DEFAULT_PAGE_NO
  from vizseq._data.zip_file import VizSeqZipFile
  from vizseq._data import get_g_translate, VizSeqGlobalConfigManager
  from vizseq._visualizers import SPAN_HIGHTLIGHT_JS
  from vizseq._utils import VizSeqJson
  from vizseq import __version__
  from tornado import web, ioloop
  from jinja2 import Environment, PackageLoader, select_autoescape
label_desc: Use image node_id 5 for calling the VizSeqBaseRequestHandler obj's underlying member method code with example usage: obj.get_page_no_arg() and returns: int