New submission from Raymond Hettinger <[email protected]>:
Candidate example:
with localcontext() as ctx:
ctx.prec += 10 # Perform a higher precision calculation
ctx.rounding = ROUND_05UP # Avoid double rounding of the final
calculation step
s = calculate_something()
s = +s # Round the final result back to the default precision
Thoughts:
* This would highlight the intended purpose of ROUND_05UP.
* Usually, it would slightly improve accuracy.
* OTOH, it would rarely make a difference in practice.
https://docs.python.org/3/library/decimal.html#decimal.localcontext
----------
assignee: rhettinger
components: Documentation
messages: 407215
nosy: mark.dickinson, rhettinger, tim.peters
priority: normal
severity: normal
status: open
title: Possibly use ROUND_05UP in decimal's localcontext() example
versions: Python 3.10, Python 3.11
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Python tracker <[email protected]>
<https://bugs.python.org/issue45918>
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