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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, \exception{SyntaxWarning} warning. In a future version of Python,
\code{None} may finally become a keyword. \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 \item Python runs multithreaded programs by switching between threads
after executing N bytecodes. The default value for N has been after executing N bytecodes. The default value for N has been
increased from 10 to 100 bytecodes, speeding up single-threaded increased from 10 to 100 bytecodes, speeding up single-threaded