[Python-Dev] Math.sqrt(-1) -- nan or ValueError? (original) (raw)

Guido van Rossum guido at python.org
Tue Sep 4 23:58:27 CEST 2007

Is this on OSX? That test has been failing (because on that platform sqrt(-1) returns nan instead of raising ValueError) for years -- but the test is only run when run in verbose mode, which mostly hides the issue. Have you read the comment for the test?

On 9/4/07, Hasan Diwan <hasan.diwan at gmail.com> wrote:

I'm trying to fix a failing unit test in revision 57974. The test in question claims that math.sqrt(-1) should raise ValueError; the code itself gives "nan" as a result for that expression. I can modify the test and therefore have it pass, but I'm not sure if an exception would be more appropriate. I'd be happy for some direction here. Many thanks!

-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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