David DiCato wrote:
… then we see that ‘inf’ is printed in both cases. The standard library tests (for example, test_cmath.py:test_abs()) seem to test for this behavior as well, and FWIW, I personally agree with this convention. However, the math module’s documentation for both 2.6 and 3.1 states, “All functions return a quiet NaN if at least one of the args is NaN.”
math.pow(1.0, nan) is another such exception to the rule. Perhaps the documentation should be updated to reflect this.
This sounds like a legitimate documentation bug for the tracker at bugs.python.org (bug reports tend to get lost/forgotten if they only exist on the mailing list). Cheers, Nick. -- Nick Coghlan | ncoghlan@gmail.com | Brisbane, Australia ---------------------------------------------------------------