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POoptimal random sequence-permutation selection in python
 

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  1. POoptimal random sequence-permutation selection in python
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    <p>I'm working on a python 2.6 script to generate poems from small bits of media transcripts.</p> <p>Atm I'm puzzling over picking a random combination of valid syllable counts to compose semirandom lines from pools of known-(syllable)length strings. The current function is inspired by the powerset() function proposed here: <a href="http://docs.python.org/release/3.1.3/library/itertools.html" rel="nofollow">http://docs.python.org/release/3.1.3/library/itertools.html</a></p> <pre><code>def valid(self, iterable, target): s = list(iterable) range_floor = target / max(s) range_ceil = target / min(s) unfiltered = chain.from_iterable(self.combinations_with_replacement(s, r) for r in range(range_floor, range_ceil)) return random.choice(list(ifilter(lambda x: sum(x) is target, unfiltered))) </code></pre> <p>For a quick example: if I had two sets of data chunked into 5 and 10 syllable units from which to assemble a 20-syllable line, valid combinations would include: (5, 5, 5, 5), (10, 10), (5, 10, 5) and (10, 5, 5). </p> <p>With large numbers of possible combinations (longer lines, more than two lengths of constituent unit) processing time gets significant--that's my main concern for now. I may ultimately just limit my scope and provide hard caps on some of the variables to avoid more intense options.</p> <p>As I write this it occurs to me that it might be the sort of situation where it'd make sense to just stick with the existing algorithm and cache/pickle past results to save myself doing the work more than once--but I don't really have a background in CS or math, so I suspect I might be overlooking something obvious to those who do. </p>
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    1. USabathur
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    1. COYou have a function? It works? What's the questioN?
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      1. POoptimal random sequence-permutation selection in python
      1. USS.Lott
    2. COIf your combinations_with_replacement function is like the one in Python 2.7, you are only choosing between (10,10) and (5,5,10) with the example data.
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      1. POoptimal random sequence-permutation selection in python
      1. USJanne Karila
    3. CONote also that you should use `==` to compare integers, not `is`. [See here](http://stackoverflow.com/q/306313/222914)
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      1. POoptimal random sequence-permutation selection in python
      1. USJanne Karila
 

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