[docs] [issue13997] Clearly explain the bare minimum Python 3 users should know about Unicode

[Nick Coghlan]

Nick Coghlan added the comment:

Current status:

#14015 is still valid (i.e. surrogateescape is not well documented)
#4153: the Unicode HOWTO still covers more than the bare minimum people need to know
Ned Batchelder's "Pragmatic Unicode" is one of the best intros to the topic I have seen: http://nedbatchelder.com/text/unipain.html

My full notes on the topic, which I'm still happy with as a "bare minimum Python 3 users should know about Unicode" are available at http://python-notes.boredomandlaziness.org/en/latest/python3/text_file_processing.html

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13997>
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