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POReading three files and writing shared items to a new file using Python
 

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  1. POReading three files and writing shared items to a new file using Python
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    <p>I have three text files. <br/>Two files (a.txt, b.txt) are formatted in the same way (> 100000000 rows, three columns of data) and <br/>one is union file from first column of both a.txt and b.txt. <br/> <br/>a.txt ('r')</p> <pre><code>MARCH2_MARCH2 2.3 0.1 MARCH2_MARC2 -0.22 0 MARCH2_MARCH5 -0.3 0.3 MARCH2_MARCH6 -1.4 0 MARCH2_MARCH7 0.1 0 MARCH2_SEPT2 -1.0 0 MARCH2_SEPT4 0.8 0 </code></pre> <p>b.txt ('r')</p> <pre><code>MARCH2_MARCH2 2.2 0 MARCH2_MARCH2.1 0.2 0 MARCH2_MARCH3 -0.4 0.1111111 MARCH2_MARCH5 -0.3 0 MARCH2_MARCH6 -0.6 0 MARCH2_MARCH7 1.2 0 MARCH2_SEPT2 0.2 0 </code></pre> <p>c.txt ('r')</p> <pre><code>MARCH2_MARCH2 MARCH2_MARCH2.1 MARCH2_MARC2 MARCH2_MARCH5 MARCH2_MARCH6 MARCH2_MARCH7 MARCH2_SEPT2 MARCH2_SEPT4 MARCH2_MARCH3 </code></pre> <p>From these files I'd like to write new files as follows. <br/> That is, insert two values within second and third column of each text file to the corresponded row which contains same value within first column (a[0] == c[0] or b[0] == c[0]). <br/>Thus, the total number of columns in new file might be five. If there is no matched value, I'd like to just insert "NA". </p> <p>new.file ('w')</p> <pre><code>MARCH2_MARCH2 2.3 0.1 2.2 0 MARCH2_MARCH2.1 NA NA 0.2 0 MARCH2_MARC2 -0.2 0 NA NA MARCH2_MARCH5 -0.3 0.3 -0.3 0 MARCH2_MARCH6 -1.4 0 -0.6 0 MARCH2_MARCH7 1.2 0 1.2 0 MARCH2_SEPT2 -1.0 0 0.2 0 MARCH2_SEPT4 0.8 0 NA NA MARCH2_MARCH3 NA NA -0.4 0.1111111 </code></pre> <p>I am looking for a solution and have tried something different including dictionary based parsing. Unfortunately, I am still new to python and all codes I made did not work properly. Please, give me your hand. <br/> Thank you so much in advance.</p>
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      1. USScott Hunter
 

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