Wilbert Berendsen <wbs...@xs4all.nl> writes:
> I find myself all over the place associating objects with each other using
> dicts as caches:
>
> something like this:
>
> _cache = {}
>
> def get_something(obj):
> """Returns the frobnicate-plugin for the specified object."""
> try:
> return _cache[obj]
> except KeyError:
> res = _cache[obj] = LargeClass(obj)
> return res
You seem to be looking for the Memoize pattern
<URL:https://secure.wikimedia.org/wikipedia/en/wiki/Memoization>.
It's best to implement Memoize as a Python decorator in one place
<URL:http://wiki.python.org/moin/PythonDecoratorLibrary#Memoize>.
Once you have that decorator, apply it to any function you like::
@memoized
def get_something(obj):
""" Returns the frobnicate-plugin for the specified object. """
res = LargeClass(obj)
return res
--
\ “Faith may be defined briefly as an illogical belief in the |
`\ occurrence of the improbable.” —Henry L. Mencken |
_o__) |
Ben Finney
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