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POComparing and appending .csv files in Python
 

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  1. POComparing and appending .csv files in Python
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    <p>I have 2 .csv files which I want to compare and append. Let's say there are numbers in column 1 file 1. I have a similar set of numbers in column 1 file 2 -- but in a different order and not all are present. I want to search through file 1 column 1 to see if there is a match for the number in column 1 file 2. If there is a match, I want to append the information from file 2 into file 1 by adding the columns to the matched number. I also get rid of any blank lines in the input file.</p> <p>For example:</p> <pre><code>File 1 Number Name EmailAddress 1 Jenny jj@ymail.com 2 Josh jh@ymail.com 3 Tony ty@gmail.org 4 Jeff jf@youtube.cc File2 Number Address 4 123 Walnut St 1 17 Yerlington Wy 7 420 St B Output File Number Name EmailAddress Address 4 Jeff jf@youtube.cc 123 Walnut St 1 Jenny jj@ymail.com 17 Yerlington Wy 7 NO ENTRY </code></pre> <p>Here's the code I have so far, which seems to do everything but append the correct information.</p> <pre><code>import csv f1 = file('inFile.csv', 'rb') f2 = file('inFile2', 'rb') f3 = file('outFile.csv', 'wb') c1 = csv.reader(f1) c2 = csv.reader(f2) c3 = csv.writer(f3) masterlist = [row for row in c2] for hosts_row in c1: row = 1 found = False for master_row in masterlist: results_row = hosts_row end_row = masterlist if any(hosts_row): if hosts_row[0] == master_row[0]: results_row.append(end_row[row][1]) found = True break if not found: results_row.append('NO ENTRY') if any(hosts_row): c3.writerow(results_row) f1.close() f2.close() f3.close() </code></pre>
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