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Thanks for feedback re: diffs.  Have now found out
about context diffs and attached new version - hope
this is better.

Regarding the patch itself, this arose out of a newbie
question on c.l.py and I was reminded that this was an
issue I'd come across in my early days too.  Personally
I'd never picked up the hint that you should use
FancyURLopener directly.

If preferred, I could have a go at patching the docs
to make that clearer?