Create kml from csv in Python

use etree to create your file

http://docs.python.org/library/xml.etree.elementtree.html

It's included with Python and protects you from generating broken XML. (eg. because fname contained &, which has special meaning in XML.)

You didn't answer the query above, but my guess is that the error is that you're not closing your output file (which would flush your output).

f.close()