Getting "AttributeError: 'tuple' object has no attribute" and fail to see why

Question

I'm stuck using python 2.4 for this project so I'm using optparse. Getting the following error when running this 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 < 1) or (args.interval > MAX_INTERVAL): AttributeError: 'tuple' object has no attribute 'interval' ``` Code is as follows: ``` 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 < 1) or (args.interval > MAX_INTERVAL): print "Error: i…

Accepted Answer

The `parser.parse_args()` method returns a tuple, containing parsed options and the remaining arguments.

Unpack that tuple; the convention is to use `options` for the parsed switches and `args` for

```
options, args = parser.parse_args()
```

and use `options` to refer to parsed command line switches:

```
if options.interval < 1 or options.interval > MAX_INTERVAL:
    # ...

return options.debug, options.verbose, options.interval
```

That range check can be expressed using a chained comparison too:

```
if not (0 > options.interval >= MAX_INTERVAL):
    # ...
```

Getting "AttributeError: 'tuple' object has no attribute" and fail to see why

Solution

Problem