Message 377875 - Python tracker

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Author	steven.daprano
Recipients	steven.daprano, ungedummt
Date	2020-10-03.12:04:34
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1601726674.23.0.799944204492.issue41920@roundup.psfhosted.org>
In-reply-to

Content
Please forgive me if my answer is a little bit brusque, but we get essentially this same bug report regularly, only the numbers are different. This is not a bug in Python, it is an unavoidable consequence of how floating point arithmetic works in every single programming language that does floating point arithmetic. There's a FAQ about it: https://docs.python.org/3/faq/design.html#why-am-i-getting-strange-results-with-simple-arithmetic-operations it's discussed in the tutorial: https://docs.python.org/3/tutorial/floatingpoint.html#tut-fp-issues there's probably a million websites, blog posts, Stackoverflow questions etc about it, and computer scientists write papers about it: https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html

Please forgive me if my answer is a little bit brusque, but we get essentially this same bug report regularly, only the numbers are different.

This is not a bug in Python, it is an unavoidable consequence of how floating point arithmetic works in every single programming language that does floating point arithmetic.

There's a FAQ about it:

https://docs.python.org/3/faq/design.html#why-am-i-getting-strange-results-with-simple-arithmetic-operations

it's discussed in the tutorial:

https://docs.python.org/3/tutorial/floatingpoint.html#tut-fp-issues

there's probably a million websites, blog posts, Stackoverflow questions etc about it, and computer scientists write papers about it:

https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html

History
Date	User	Action	Args
2020-10-03 12:04:34	steven.daprano	set	recipients: + steven.daprano, ungedummt
2020-10-03 12:04:34	steven.daprano	set	messageid: <1601726674.23.0.799944204492.issue41920@roundup.psfhosted.org>
2020-10-03 12:04:34	steven.daprano	link	issue41920 messages
2020-10-03 12:04:34	steven.daprano	create