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Mention change in MRO

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Andrew M. Kuchling 2002-11-15 14:37:10 +00:00
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Doc/whatsnew/whatsnew23.tex
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@ -854,6 +854,19 @@ command line or use \function{warnings.filterwarnings()}.
\exception{SyntaxWarning} warning. In a future version of Python,
\code{None} may finally become a keyword.
\item The method resolution order used by new-style classes has
changed, though you'll only notice the difference if you have a really
complicated inheritance hierarchy. (Classic classes are unaffected by
this change.) Python 2.2 originally used a topological sort of a
class's ancestors, but 2.3 now uses the C3 algorithm as described in
\citetitle[http://www.webcom.com/haahr/dylan/linearization-oopsla96.html]{``A
Monotonic Superclass Linearization for Dylan''}. To understand the
motivation for this change, read the thread on python-dev starting
with the message at
\url{http://mail.python.org/pipermail/python-dev/2002-October/029035.html}.
Samuele Pedroni first pointed out the problem and also implemented the
fix by coding the C3 algorithm.
\item Python runs multithreaded programs by switching between threads
after executing N bytecodes. The default value for N has been
increased from 10 to 100 bytecodes, speeding up single-threaded