just> I actually prefer such a global variable to the default arg
just> trick. The idiom I generally use is:
just> _cache = {}
just> def func(x):
just> result = _cache.get(x)
just> if result is None:
just> result = x + 1 # or a time consuming calculation...
just> _cache[x] = result
just> return result
None of the responses I've seen mention the use of decorators such as the
one shown here:
http://wiki.python.org/moin/PythonDecoratorLibrary
While wrapping one function in another is obviously a bit slower, you can
memoize any function without tweaking its source.
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