old_contents: from flask import Flask
  from optparse import OptionParser
  from yum_mock.yum_mock import yum_mock
  
  app = Flask(__name__)
  #app.register_blueprint(working_repo)
  app.register_blueprint(yum_mock, url_prefix='/yum')
  
  
  if __name__ == '__main__':
      parser = OptionParser("%prog [options]")
      parser.add_option(
          "-d", "--debug",
          action="store_true",
      )
      parser.add_option(
          "-p", "--port",
          default=5000,
          type="int",
      )
      parser.add_option(
          "-n", "--host",
          default="127.0.0.1",
      )
      parser.add_option(
          "--passthrough_errors",
          action="store_true",
      )
      options, args = parser.parse_args()
  
      kwargs = {
          "threaded": True,
          "debug": options.debug,
          "port": options.port,
          "host": options.host,
          "passthrough_errors": options.passthrough_errors,
      }
  
      app.run(**kwargs)
  
new_contents: from flask import Flask
  from optparse import OptionParser
  try:
      from yum_mock.yum_mock import yum_mock
  except (ValueError, ImportError):
      from .yum_mock.yum_mock import yum_mock
  
  app = Flask(__name__)
  #app.register_blueprint(working_repo)
  app.register_blueprint(yum_mock, url_prefix='/yum')
  
  
  if __name__ == '__main__':
      parser = OptionParser("%prog [options]")
      parser.add_option(
          "-d", "--debug",
          action="store_true",
      )
      parser.add_option(
          "-p", "--port",
          default=5000,
          type="int",
      )
      parser.add_option(
          "-n", "--host",
          default="127.0.0.1",
      )
      parser.add_option(
          "--passthrough_errors",
          action="store_true",
      )
      options, args = parser.parse_args()
  
      kwargs = {
          "threaded": True,
          "debug": options.debug,
          "port": options.port,
          "host": options.host,
          "passthrough_errors": options.passthrough_errors,
      }
  
      app.run(**kwargs)
  
subject: Modify imports to be able to run server.py directly