old_contents: """Unit tests init."""
  
  import json
  import os
  import time
  import unittest
  
  try:
      from selenium import webdriver
      from selenium.common.exceptions import WebDriverException
  except ImportError as imp_err:
      raise ImportError('Failed to import \'selenium\':\n' + imp_err)
  
  from network_crawler.api.operator_web_site import OperatorWebSite
  
  __all__ = ['json', 'os', 'time', 'unittest',
             'webdriver', 'WebDriverException', 'OperatorWebSite', ]
  
new_contents: """Unit tests init."""
  
  import json
  import os
  import time
  import unittest
  
  try:
      from selenium import webdriver
      from selenium.common.exceptions import WebDriverException
  except ImportError as imp_err:
      raise ImportError('Failed to import \'selenium\':\n' + str(imp_err))
  
  from network_crawler.api.operator_web_site import OperatorWebSite
  
  __all__ = ['json', 'os', 'time', 'unittest',
             'webdriver', 'WebDriverException', 'OperatorWebSite', ]
  
subject: Update __init__.py