title: Python's decimal module and the table maker's dilemma
body: <p>According to <a href="http://docs.python.org/2/library/decimal.html" rel="nofollow">the documentation</a>, the .exp() operation in
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  Python's decimal module "is correctly rounded using  ...".</p>
  
  <p>Because of the <a href="http://en.wikipedia.org/wiki/Rounding#The_table-maker.27s_dilemma" rel="nofollow">table maker's dilemma</a>, I hope that's not guaranteed, since I'd prefer a guarantee
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  that it's computation on a normal-looking input with moderately low precision won't take, eg., a year.</p>
  
  <p>How does Python address this?
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  (Is it different between versions?)</p>