[issue44910] Floating point issue

[A wilson]

New submission from A wilson :

0.01 + 273.15 should equal 273.16 but in python 3.9.5 or earlier report as 
273.159997.

--
messages: 399550
nosy: afw2alan
priority: normal
severity: normal
status: open
title: Floating point issue
type: behavior
versions: Python 3.9

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[issue44910] Floating point issue

[A wilson]

A wilson  added the comment:

Eric,

I was unaware of this document and its implementation in python.

where
0.01+0.15 = 0.16 but 0.01+273.15=273.159997

the latter which should be 273.16 which is triple point temperature of water in 
Kelvin.

This floating point variance explains some if the conditional test failures I 
have encountered.

regards

Alan

Get Outlook for Android<https://aka.ms/ghei36>


From: report=bugs.python@roundup.psfhosted.org 
 on behalf of Eric V. Smith 

Sent: Friday, 13 August 2021, 21:52
To: afw2a...@outlook.com
Subject: [issue44910] Floating point issue

Eric V. Smith  added the comment:

This a limitation of the floating point type that python uses. See 
https://docs.python.org/3/tutorial/floatingpoint.html

--
nosy: +eric.smith
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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