Again creative solution for Digits Multiplication by veky - python coding challenges

Enable Javascript in your browser and then refresh this page, for a much enhanced experience.

Again solution in Creative category for Digits Multiplication by veky

import operator, functools
checkio=lambda n:functools.reduce(operator.mul,filter(None,map(int,str(n))))

Feb. 20, 2014

Comments:

dirk86 on March 2, 2014, 2:38 p.m.
I don't think this should be in category "clear"

veky on March 2, 2014, 3:42 p.m.
Nothing should be in the category Clear. :-P

dirk86 on March 2, 2014, 7:02 p.m.
I always expect your solutions to be in the "puzzle" category ;)

veky on March 2, 2014, 9:27 p.m.
I know. Everybody does. :-]

Freiling on July 2, 2017, 9:03 p.m.
Shouldn't this be under "Third-party?"

veky on July 3, 2017, 2:14 a.m.
Why? What's third-party here?

hezhe88 on Nov. 16, 2015, 10:58 p.m.
If anyone is also wondering how filter function eliminates zeros: <a href="https://docs.python.org/2/library/functions.html">https://docs.python.org/2/library/functions.html</a>#filter "[item for item in iterable if item] if function is None."

veky on Nov. 17, 2015, 6:14 p.m.
[Please refer to Py3 documentation when reviewing Py3 code. Here it doesn't matter much, but it might make a big difference.] Yes, `partial(filter, None)` is important special case. A homework, for who's interested: why a special case, when the same thing can be said with `partial(filter, bool)`? ;-)

hezhe88 on Nov. 18, 2015, 3:22 a.m.
I cannot think anything other than historical reasons. Is there a case that the result will be different? Thank you!

veky on Nov. 18, 2015, 5:18 a.m.
History is important, but not necessarily in Py3. It removed many warts. This is not a wart because: <ul> <li>performance [Python is obsessed by performance, so you, its programmer, don't have to be:]. Function calls are slow, and it's important to have a fast path when you don't need to call a function on every element before testing. Virtual machine knows how to test for truth natively.</li> <li>scoping. `bool` is just a name, it can be rebound. For example, you can say `bool = True.eq` for stricter truths. :-) None is a keyword literal, it always means what you think it means.</li> </ul> [BTW, that's the same reason why we have empty `except:` (despite it being a very attractive nuisance for newbies) instead of `except BaseException:`. When you really want to "collect them all" no matter what, it would be horrible if your efforts could be thwarted just by `BaseException = NameError`, for example.;] [Of course, that raises the question of why not just call filter with one argument, reversing the order of arguments when you need to have the function? That one is probably just history. ;-) filter was always clustered together with map, not with max.:]

Strings and Integers

0 %

You ClassRoom Demo is Ready With the new tool CheckiO ClassRoom, you will be able to analyze your students' progress, have your own leaderboard, change missions order on the map, and so on.