All you need creative solution for Digits Multiplication by veky - python coding challenges

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All you need solution in Creative category for Digits Multiplication by veky

from math import exp, log
checkio = lambda n: round(exp(sum(map(log, filter(None, map(int, str(n)))))))

Feb. 20, 2015

Comments:

grutte_pier on Feb. 22, 2015, 8:23 p.m.
As usual you managed to come up with an extraordinary solution

veky on Feb. 22, 2015, 9:39 p.m.
Usually extraordinary - yep, sounds like me. :-D Guido <a href="http://www.artima.com/weblogs/viewpost.jsp?thread=98196">promised</a> us product in place of reduce, but so far hasn't fulfilled that promise. My guess is that he realized that with exp, log and complex numbers, you just need sum anyway. :-P [/sarcasm], of course. But there is a nice saying in multivariable calculus that the only truly binary function is sum - every function of many variables is expressible (possibly in cases) as composition of sum and one-variable functions. The saying isn't true, of course, but still it serves as a nice rule of thumb for sufficiently nice functions. :-)

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