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| author | Skip Montanaro <skip@pobox.com> | 2004-03-21 16:05:30 (GMT) |
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| committer | Skip Montanaro <skip@pobox.com> | 2004-03-21 16:05:30 (GMT) |
| commit | 20a8336ff76baeed972dfc2c559615ef4f2a50b2 (patch) | |
| tree | 9123680cf296f194df1a0670fd2881d5f3ee81b7 | |
| parent | 347c30d217cc4c9b832bb34e0b8e65346f3877fe (diff) | |
| download | cpython-20a8336ff76baeed972dfc2c559615ef4f2a50b2.zip cpython-20a8336ff76baeed972dfc2c559615ef4f2a50b2.tar.gz cpython-20a8336ff76baeed972dfc2c559615ef4f2a50b2.tar.bz2 | |
concrete example of why retaining old objects is good
| -rw-r--r-- | Doc/lib/libfuncs.tex | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/Doc/lib/libfuncs.tex b/Doc/lib/libfuncs.tex index a96fe49..f596cec 100644 --- a/Doc/lib/libfuncs.tex +++ b/Doc/lib/libfuncs.tex @@ -830,7 +830,15 @@ class C(object): 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 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 dynamically loaded modules, except for \refmodule{sys}, |