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POPython match all substrings and reversed strings
 

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  1. POPython match all substrings and reversed strings
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    <p>I have to match all occurrences of substring in a string and return all match starting positions:</p> <p>example of input data:</p> <pre><code>2 4 AC TGGT 4 25 CATA TCATATGCAAATAGCTGCATACCGA 0 0 ## to end the file </code></pre> <p>I would like to do this without using numbers in such lines as it seems not really necessary;(but they will still be in the input files) </p> <p>And I don't know exactly what's wrong with this code, but it keeps printing (infinity loop) of printing 0s on the output file. </p> <pre><code>#!/usr/bin/env python import sys from operator import itemgetter def find_all(a_str, sub): start = 0 while True: start = a_str.find(sub, start) if start == -1: return yield start start += len(sub) if __name__ == '__main__': testnum=0 input_file = open(sys.argv[1]) #input_lines=input_file.split("\n") output_file = open(sys.argv[2],"w") while True: testnum+=1 values_raw = input_file.readline() #values_raw=raw_input() ##rubish values=values_raw.split() flag=0 for element in values: if element == "0": break string1=str(input_file.readline()) string2=str(input_file.readline()) lista = find_all(string2,string1) output_file.write("\nTeste "+str(testnum)+"\nocorrencia direta: ") for item in lista: output_file.write(str(item)+" ") #reversed search string1=string1[::-1] lista = find_all(string2,string1) output_file.write("\nTeste "+str(testnum)+"\nocorrencia inversa complementar: ") for item in lista: output_file.write(str(item)+" ") if ((len(string1)==0)): break </code></pre> <p>I accidentally removed the string1 and string2 lines when pasting the code //I match for the original and for the reversed match, but as the code is almost the same I thought I shouldn't post it too. </p>
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    1. USMansueli
    1. USMansueli
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    1. CO`if element == 0` is always false. `element` is a `str`, not a number. besides, `string1` and `string2` are never assigned into - they have no binding in this code.
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      1. USElazar
    2. COI accidentally removed them in the original posting, but I believe that what I did to read the files is wrong...
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      1. USMansueli
 

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