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My tiny errata for Python Essential Reference
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Python_Essential_Reference_errata.rst

Errata for Python Essential Reference

Fourth Edition (by David M. Beazley)

Chapter 9

p. 170 ++++ I'm myself by no means UTF-8 guru but there is some inconsistency with RFC3629: Last two bytes are 7bit long:: - 11110nnn 10nnnnnn 10nmmmm 10mmmmmm + 11110www 10xxxxxx 10yyyyyy 10zzzzzzz

3 + 6 + 6 + 6 = 21 bits which maps to::

00000000 000wwwxx xxxxyyyy yyzzzzzz

Chapter 15

p. 271

count() does not overflow (at least in Python 2.6+).

Chapter 21

p. 450 - p. 451

Should shutdown/close be added to Figures? Also I suppose TCP client may preform bind() and UDP client can use connect() + send()

Chapter 24

p. 560

!= and == based comparisons in python have very nasty time side channel and should never ever used in crypto:: $ python -m timeit -c '"0"16 != "1"16' 10000000 loops, best of 3: 0.153 usec per loop $ python -m timeit -c '"1"16 != "1"16' 10000000 loops, best of 3: 0.145 usec per loop

Chapter 26 ---------p. 593 ++++++ To run file in current directory you should use:: - a.out + ./a.out

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