Thanks for all your help guys, I am getting a strong consensus that
f.close() should be used everywhere, reading files as well as writing
files and not to rely on the PVM to do clean-up for you.
The whole topic came up because I just finished reading 'learning
python' 3rd edition OReilly as a refresher where there are multiple
instances of suggesting that you do the exact opposite eg ...
[line.rstrip() for line in open('myfile')] ... p361
for line in open('script1.py') ... p261& p276 where it is described as
'best practice' for reading files line by line
etc ...
Dave
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