Mike Kent wrote: > robert wrote: >> I want to use a computation cache scheme like >> >> >> o = CACHECOMPUTE complex-key-expr expensive-calc-expr >> >> >> frequently and elegantly without writing complex-key-expr or >> expensive-calc-expr twice. >> So its ugly: >> >> _=complex-key-expr; o=cache.get(_) or >> cache.setdefault(_,expensive-calc-expr) >> >> Any ideas? >> >> -robert > > Your question is a bit terse, so my answer might not be spot on for it, > but it sounds like you want what is typically called 'memoization', > whereby a function caches its expensive-to-calculate return values, > where the cache is keyed by the function arguments. > > See: > http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/52201 > and various other implimentations in the Cookbook for details. >
thanks, yes, but the challenge was to hook expressions for memoizing ad hoc. See above solution. -- http://mail.python.org/mailman/listinfo/python-list
