Get outa here creative solution for Robot Sort by veky - python coding challenges

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Get outa here solution in Creative category for Robot Sort by veky

def swapsort(array):
    l = list(array)
    try: m = l.index(max(l))
    except ValueError: return ""
    else:
        l.pop(m)
        start = "".join("{}{},".format(i,i+1) for i in range(m, len(l)))                
        return (start + swapsort(l)).rstrip(",")

July 9, 2014

Comments:

coells on July 26, 2014, 7:31 p.m.
I have noticed before that you're using exceptions to handle conditions, mostly for fun, I guess. Why in this case? While cycle would be way easier.

veky on July 26, 2014, 8:30 p.m.
"for fun" has many meanings. Everything I write here is "for fun" in a way. :-) But usually behind that "fun" there lurks a powerful concept I'm trying to teach anyone willing to listen. ;-) EAFP is a powerful philosophy. It's an acronym for "it's Easier to Ask for Forgiveness than for Permission", and its main tenet is that you should be optimistic, try to do something and think about consequences later, instead of wondering all the time whether your next step is possible. Compare two pieces of pseudoPython and note the following properties: <pre class='brush: python'>if I can do something: | try: do something | do something else: | except Reason: do another thing | do another thing </pre> <ul> <li>P-way is repetitive. Notice how "do something" is repeated on the left side. In the real code, repetition isn't so literal, but that only makes it harder to notice it (and to maintain the code if "something" needs to be changed).</li> <li>F-way is more declarative. You write semantically what you want to do, and what is the alternative, instead of checking conditions "manually".</li> <li>F-way gives more information. Notice that "Reason" on the right side. It has no counterpart on the left side. It is explicit, it forces you to think (and document for future readers) what exactly can go wrong.</li> <li>P-way is prone to race conditions. Between the if and the do, world can change. Many times I've seen the code "if file exists, delete it". It's wrong and potentially dangerous.</li> </ul>

Blizzard

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