> > What's the advantage of using two calls to getcontext() vs. saving
the
> > context in a local variable?
>
> I also prefer saving the context in a local variable but that is just
a
> micro-optimization. The presentation with multiple calls to
> getcontext() was kept just to match the style of the original -- the
> important change was the absolute save and restore versus the original
> relative adjust up and adjust down.
One more thought: Rather than just saving the precision, it is likely
wiser, safer, and more general to just save and restore the whole
context and let the wrapped block only work with a copy.
oldcontext = decimal.getcontext()
newcontext = oldcontext.copy()
newcontext.prec += 2
yield None
decimal.setcontext(oldcontext)
This approach defends against various kinds of unruly behavior by the
yield target.
Raymond Hettinger
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