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    <p>For fun and interest, I've rewritten the problem using OO. See what you think:</p> <pre><code>import collections import sys import random usage = """ Usage: sequence fname expected Where fname: name of file containing fragments expected: result-string which should be obtained by chaining from first fragment. """ class Frag(str): MATCHLEN = 7 def __new__(cls, s=''): return str.__new__(cls, s.strip()) def head(self): return Frag(self[:Frag.MATCHLEN]) def tail(self): return Frag(self[Frag.MATCHLEN:]) def nexthead(self): return Frag(self[-Frag.MATCHLEN:]) def check(self, s): return self.__eq__(s) def __add__(self, s): return Frag(str(self).__add__(s)) class Fraglist(list): @classmethod def fromFile(cls, fname): with open(fname, "r") as inf: lst = [Frag(ln) for ln in inf] return cls(lst) def shuffle(self): random.shuffle(self) class Sequencer(object): def __init__(self, seq=None): super(Sequencer, self).__init__() self.sequences = collections.defaultdict(list) if seq is not None: for frag in seq: self.sequences[frag.head()].append(frag.tail()) def build(self, frag): res = [frag] match = frag.nexthead() while match in self.sequences: next = random.choice(self.sequences[match]) res.append(next) match = (match + next).nexthead() return Frag(''.join(res)) def main(): if len(sys.argv) != 3: print usage sys.exit(-1) else: fname = sys.argv[1] expected = sys.argv[2] frags = Fraglist.fromFile(fname) frag1 = frags.pop(0) frags.shuffle() seq = Sequencer(frags) result = seq.build(frag1) if result.check(expected): print "Match!" else: print "No match" if __name__=="__main__": main() </code></pre>
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    1. USHugh Bothwell
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    1. COto be honest I'm not so keen in python to understand everything. But it seems to be good. I will talk with my friend, with whom I'm doing that project, to look at it. Thanks so much! ;)
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      1. USMateusz Korycinski
 

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