title: How to create and use custom command line parameters in locust
body: <p>I was able to add custom command line parameters to locust script like below -
  '''
  @events.init_command_line_parser.add_listener
  def init_parser(parser):
  parser.add_argument(
  '--custom-argument',
  help=&quot;It's working&quot;
  )
  '''</p>
  <p>But I am unable to use the custom argument anywhere else in the script.</p>