On May 17, 2005, at 9:02 PM, Raymond Hettinger wrote:
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.
I think you're missing a decimal.setcontext(newcontext) before the yield.. -bob