code: def sign(conf):
      
      try:
          v2ex = V2ex(conf.config)
          v2ex.login()
          balance = v2ex.get_money()
          click.echo(balance)
      except KeyError:
          click.echo('Keyerror, please check your config file.')
      except IndexError:
          click.echo('Please check your username and password.')
docs: Sign in and get money.