"Is a directory" - This Python error is both correct and unhelpful

[stetho]

I was having a problem with my original install of pywws and I never got it to work correctly so I built a VM with Ubuntu Server 10.04 and installed all the requirements from packages. Now I have a different error message which I can't get to the bottom of and it's driving me crazy.

My weather.ini includes the lines

[paths]

templates = /home/steve/weather/templates/

work = /tmp/weather

graph_templates = /home/steve/weather/graph_templates/

Running any of the logging programs (hourly, live, etc) results in the message

22:21:27:pywws:[Errno 21] Is a directory: '/home/steve/weather/graph_templates/'

Traceback (most recent call last):

  File "LiveLog.py", line 137, in <module>

    sys.exit(main())

  File "LiveLog.py", line 132, in main

    return LiveLog(args[0])

  File "LiveLog.py", line 103, in LiveLog

    tasks.do_live(data)

  File "/home/steve/weather/pywws-12.05_r521/pywws/Tasks.py", line 100, in do_live

    upload = self.do_plot(template)

  File "/home/steve/weather/pywws-12.05_r521/pywws/Tasks.py", line 186, in do_plot

    if self.plotter.DoPlot(input_file, output_file) == 0:

  File "/home/steve/weather/pywws-12.05_r521/pywws/Plot.py", line 44, in DoPlot

    self.doc = xml.dom.minidom.parse(input_file)

  File "/usr/lib/python2.6/xml/dom/minidom.py", line 1918, in parse

    return expatbuilder.parse(file)

  File "/usr/lib/python2.6/xml/dom/expatbuilder.py", line 922, in parse

    fp = open(file, 'rb')

IOError: [Errno 21] Is a directory: '/home/steve/weather/graph_templates/'

What I think it's trying to tell me is that it doesn't expect /home/steve/weather/graph_templates/ to be a directory - but it is and there's not much I can do about it.

Changing the directory path in weather.ini gives the expected error of

IOError: [Errno 2] No such file or directory: '/home/changed_this_bit/weather/graph_templates/'

And removing the final slash from the path makes no difference. 

Can someone tell me what it is I'm missing? The error message is obviously telling me something but I can't see it. It might be a "woods for the trees" situation.

Thanks

Steve

[Jim Easterbrook]

The key here is "self.doc = xml.dom.minidom.parse(input_file)" - which
fails because input_file is a directory. Do you have an empty string in
one of your plot lists in weather.ini?
--
Jim Easterbrook <http://www.jim-easterbrook.me.uk/>

[Steve Thompson]

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Yes, that was it. If those two things were on the same line - "input_file is a directory" for example - I might have been able to figure it out! Thanks for that.

Steve