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

Hasan Diwan hasan.diwan at gmail.com
Wed Sep 5 00:13:50 CEST 2007

On 04/09/07, Guido van Rossum <guido at python.org> wrote:

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?

Indeed, I am on OSX. Yes, I have read the comment for the test. Would the following pseudocode be an acceptable fix for the problem: if sys.platform == 'darwin' and math.sqrt(-1) == nan: return else: try: x = math.sqrt(-1) except ValueError: pass ... or should I just not bother?

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