title: Getting "AttributeError: 'tuple' object has no attribute" and fail to see why
body: <p>I'm stuck using python 2.4 for this project so I'm using optparse. Getting the following error when running this code:</p>
  
  <pre><code>Traceback (most recent call last):
    File "./clientNFSLatMonME.py", line 49, in ?
      debug,verbose,interval = parseOptions()
    File "./clientNFSLatMonME.py", line 43, in parseOptions
      if (args.interval &lt; 1) or (args.interval &gt; MAX_INTERVAL):
  AttributeError: 'tuple' object has no attribute 'interval'
  </code></pre>
  
  <p>Code is as follows:</p>
  
  <pre><code>MAX_INTERVAL = 1800
  
  def parseOptions():
  
      parser = OptionParser()
      parser.add_option("-d", "--debug",    dest="debug",    action="store_true", help="enable additional debugging output")
      parser.add_option("-v", "--verbose",  dest="verbose",  action="store_true", help="enable additional console output")
      parser.add_option("-i", "--interval", dest="interval", action="store", type="int", default=900, help="specify the time interval, default is 900, maximum is 1800")
  
      args = parser.parse_args()
  
      if (args.interval &lt; 1) or (args.interval &gt; MAX_INTERVAL):
          print "Error: interval must be between 1 and " + str(MAX_INTERVAL) + ", terminating."
          system.exit(1)
  
      return args.debug, args.verbose, args.interval
  
  debug,verbose,interval = parseOptions()
  </code></pre>