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concrete example of why retaining old objects is good

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Skip Montanaro 2004-03-21 16:05:30 +00:00
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Doc/lib/libfuncs.tex
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@ -830,7 +830,15 @@ class C(object):
old version, the old definition remains. This feature can be used old version, the old definition remains. This feature can be used
to the module's advantage if it maintains a global table or cache of to the module's advantage if it maintains a global table or cache of
objects --- with a \keyword{try} statement it can test for the objects --- with a \keyword{try} statement it can test for the
table's presence and skip its initialization if desired. table's presence and skip its initialization if desired:
\begin{verbatim}
try:
cache
except NameError:
cache = {}
\end{verbatim}
It is legal though generally not very useful to reload built-in or It is legal though generally not very useful to reload built-in or
dynamically loaded modules, except for \refmodule{sys}, dynamically loaded modules, except for \refmodule{sys},