Message 370255 - Python tracker

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In-reply-to
Author	serhiy.storchaka
Recipients	mark.dickinson, serhiy.storchaka, zach.ware
Date	2020年05月28日.17:27:56
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1590686876.93.0.758851621751.issue40801@roundup.psfhosted.org>

Content
The problem with the roundtrip PyFloat_FromDouble(PyFloat_AsDouble(obj)) is that (in contrary to PyNumber_Index()) it is lossy. Converting Decimal, Fraction, float128 to float before using it in expression can lead to loss of precision. So such conversion looks to me less useful than operator.index().

Content

The problem with the roundtrip PyFloat_FromDouble(PyFloat_AsDouble(obj)) is that (in contrary to PyNumber_Index()) it is lossy. Converting Decimal, Fraction, float128 to float before using it in expression can lead to loss of precision.
So such conversion looks to me less useful than operator.index().

History
Date	User	Action	Args
2020年05月28日 17:27:56	serhiy.storchaka	set	recipients: + serhiy.storchaka, mark.dickinson, zach.ware
2020年05月28日 17:27:56	serhiy.storchaka	set	messageid: <1590686876.93.0.758851621751.issue40801@roundup.psfhosted.org>
2020年05月28日 17:27:56	serhiy.storchaka	link	issue40801 messages
2020年05月28日 17:27:56	serhiy.storchaka	create

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