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    <p>First of all, you don't have separator in your csv files, I had to rewrite them like this (comma separator):</p> <p>inFile.csv:</p> <pre><code>Number,Name,EmailAddress 1,Jenny,jj@ymail.com 2,Josh,jh@ymail.com 3,Tony,ty@gmail.org 4,Jeff,jf@youtube.cc </code></pre> <p>inFile2.csv:</p> <pre><code>Number,Address 4,123 Walnut St 1,17 Yerlington Wy 7,420 St B </code></pre> <p>Then you have few problems in your code:</p> <ul> <li>you are missing the check for empty master_row</li> <li>strange variable end_row is doing something you don't want and is practically useless as you really want to append <code>master_row[1]</code></li> <li>condition for <code>not found</code> is in wrong block, so 'NO ENTRY' is appended multiple times</li> <li>there is unused variable <code>row</code></li> <li>(just enhancement) python will close files for you when their variables comes out of scope, so you can remove close() calls</li> </ul> <p>After my fixes:</p> <pre><code>import csv f1 = file('inFile.csv', 'rb') f2 = file('inFile2.csv', '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: found = False for master_row in masterlist: results_row = hosts_row if hosts_row and master_row: if hosts_row[0] == master_row[0]: results_row.append(master_row[1]) found = True break if not found: results_row.append('NO ENTRY') if any(hosts_row): c3.writerow(results_row) </code></pre> <p>output file:</p> <pre><code>Number,Name,EmailAddress,Address 1,Jenny,jj@ymail.com,17 Yerlington Wy 2,Josh,jh@ymail.com,NO ENTRY 3,Tony,ty@gmail.org,NO ENTRY 4,Jeff,jf@youtube.cc,123 Walnut St </code></pre> <p>HTH</p>
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    1. POComparing and appending .csv files in Python
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    1. USTomáš Diviš
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    1. POComparing and appending .csv files in Python
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    1. COThank you for your input! I realized there were a few bugs after posting, so thank you for pointing those out. But when I use your code, for some reason instead of the correct addresses, all addresses come out as address or NO ENTRY. I'm only getting the title to show and not the correct unit. Any insight?
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    2. COHmm, that's strange, it works for me (produces the "output file" I pasted). The address is appended on line `results_row.append(master_row[1])` so maybe try to print "master_row" and "master_row[1]" before it to see what is really happening.
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    3. COThanks again. Actually, this time it was the file itself that had been corrupted on my computer! When I re-saved the file, everything worked perfectly.
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