code: def use_colab(port):
      try:
          from google.colab.output import eval_js
  
          colab_host = eval_js(
              'google.colab.kernel.proxyPort(%d, {"cache": false})'
              % port
          )
          return (
              colab_host[:-1]
              if colab_host.endswith("/")
              else colab_host
          )
      except BaseException:
          return None
  
imports: from __future__ import absolute_import, print_function
  import getpass
  import jinja2
  import logging
  import os
  import pandas
  import random
  import socket
  import sys
  import time
  import traceback
  from builtins import map, str
  from contextlib import closing
  from logging import ERROR
  from threading import Timer
  from werkzeug.routing import Map
  from flask import Flask, jsonify, redirect, render_template, request, url_for
  from flask.testing import FlaskClient
  import requests
  from flask_compress import Compress
  from six import PY3
  import dtale.auth
  import dtale.global_state
  import dtale.config
  from dtale import dtale
  from dtale.cli.clickutils import retrieve_meta_info_and_version, setup_logging
  from dtale.dash_application import views
  from dtale.utils import DuplicateDataError, build_shutdown_url, build_url, dict_merge, fix_url_path, get_host, get_url_unquote, is_app_root_defined, make_list, running_with_flask_debug
  from dtale.views import DtaleData, head_endpoint, is_up, kill, startup
label_desc: Use image node_id 7 for calling a global function with example usage: use_colab(port) and returns: unknown, None