What's the advantage of using two calls to getcontext() vs. saving the context in a local variable? On 5/17/05, Raymond Hettinger <python@rcn.com> wrote:
-----Original Message----- From: python-dev-bounces+python=rcn.com@python.org [mailto:python-dev- bounces+python=rcn.com@python.org] On Behalf Of Phillip J. Eby Sent: Tuesday, May 17, 2005 6:06 PM To: Michael Chermside; gvanrossum@gmail.com 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
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