Johannes, Looking at your Python code and the error, I expect the issue is with the way you are calling the script, rather than it's content.
From the documentation, g.parser returns a Python dictionary. The options "command" is a variable, rather than a function. http://grass.osgeo.org/grass64/manuals/html64_user/g.parser.html The key error occurs when you attempt to access a key, in your case upstream_shreve, when it does not exist. http://wiki.python.org/moin/KeyError I suspect the problem is that you're not setting a value for upstream_shreve from the command line, i.e., ./test3.py upstream_shreve=newmapname upstream_part=upstreammap shreve=anothermap In your Python script, if you throw in: print options You'll be able to quickly check it contains the key-value pairs you expect. Hope this helps, Josh.
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