What's the advantage of using two calls to getcontext() vs. saving the context in a local variable?
On 5/17/05, Raymond Hettinger <[EMAIL PROTECTED]> wrote: > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:python-dev- > > [EMAIL PROTECTED] On Behalf Of Phillip J. Eby > > Sent: Tuesday, May 17, 2005 6:06 PM > > To: Michael Chermside; [EMAIL PROTECTED] > > Cc: python-dev@python.org > > Subject: Re: [Python-Dev] Example for PEP 343 > > > > At 02:42 PM 5/17/2005 -0700, Michael Chermside wrote: > > > > ># ===== SAMPLE #1: increasing precision during a sub-calculation > ===== > > > > > >import decimal > > > > > >@do_template > > >def with_extra_precision(places=2): > > > "Performs nested computation with extra digits of precision." > > > decimal.getcontext().prec += 2 > > > yield None > > > decimal.getcontext().prec -= 2 > > > > Won't this do the wrong thing if something within the block alters the > > precision? > > Right. > > It should save, alter, and then restore: > > oldprec = decimal.getcontext().prec > decimal.getcontext().prec += 2 > yield None > decimal.getcontext().prec = oldprec > > > Raymond Hettinger > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/guido%40python.org > -- --Guido van Rossum (home page: http://www.python.org/~guido/) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
