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  1. PO
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    <p>The error you're getting is probably due to the file lengths not being equal.</p> <p>It's not exactly clear from what you've written, what you're hoping to do. It looks to me like (maybe) you want to find a search term in "master file", and if you find it, write the line you find to the "save file". It also looks to me like you want to find that same search term in the very first field of the "check file", and if you find it, write the contents of the third field into the "save file". If that's wrong, it's because your code has bugs.</p> <p>Either way, there's a bunch of issues in the code you've posted, and you're probably going to get at least some mileage out of using the <code>csv</code> module to do what you're trying to do.</p> <p>Maybe post a fuller problem description.</p> <p>Edit:</p> <pre><code>import csv import sys def build_state_lookup(fn): with open(fn) as infile: reader = csv.reader(infile) # throw away first line reader.next() # now build a dictionary mapping state to region lookup = {state: region for (state, _, region) in reader} return lookup def process_big_file(in_fn, checkfile, out_fn): lookup = build_state_lookup() with open(in_fn) as infile: with open(out_fn, 'w') as outfile: reader = csv.reader(infile) writer = csv.writer(outfile) # output the header row writer.writerow(reader.next() + ['Region']) for row in reader: state = row[0] region = lookup.get(state, "No Region Found") row.append(region) writer.writerow(row) def main(): process_big_file(*sys.argv[1:]) if __name__ == '__main__': main() </code></pre>
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    1. POPython compare bombs if files not sorted
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    1. USGeoff Gerrietts
    1. USGeoff Gerrietts
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    1. CORemcoGerlich Helped a lot. with his reply.. The files are 55 and 52 lines each. This is just a test before I scale up to much larger files. What I am trying to do is there is State,Item,Person,Variance,Days in the "file" Checkfile has State, Full_State_Name, Region. What I want to do is when they enter a state code into the "search string" (e.g. DC) it brings back all the DC lines with the region name after the line. So in File You may have DC,12345678,John,4%,5 and in checkfile you have all the states like DC, District of Columbia, Region1
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    2. COSo I think what you have is two files, and you want to join them on "State" and output everything from one file, and the Region from the other?
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      1. USGeoff Gerrietts
    3. COI added a complete solution that probably does what you want. Please ask questions about it. :)
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      1. USGeoff Gerrietts
 

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