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POCompare two CSV files against a master CSV file and merge the results into a new file
 

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  1. POCompare two CSV files against a master CSV file and merge the results into a new file
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    <p>I have 3 CSV files. I have one master CSV document that holds the bulk of the information I'll need down the road. But is missing data from two other CSV documents. The goal is to compare the master document to each of the other CSVs, pull the specified data from the 2 CSVs and add that info to the rows in the master CSV. Finally writing them to a new file.</p> <p>Here is what I've gotten so far, not that it works.</p> <p><strong>inv</strong> = is the master document, it has 99% of the information I need</p> <p><strong>vb</strong> = has in common 'PART CODE' with inv's '\xef\xbb\xbfPART_CODE', I need it's 'ON-HAND' added to inv's row </p> <p><strong>main</strong> = has in common 'PART CODE' with inv's '\xef\xbb\xbfPART_CODE', I need it's 'ON-HAND' added to inv's row </p> <pre><code>import csv inv = csv.DictReader(open('ireport.txt', 'rU'), dialect='excel-tab', delimiter="\t") vb = csv.DictReader(open('vb.txt', 'rU'), dialect='excel-tab', delimiter="\t") main = csv.DictReader(open('main.txt', 'rU'), dialect='excel-tab', delimiter="\t") vblist = [] mainlist = [] def vbfunc(dictreader1, dictreader2): dictreader2 = list(dictreader2) for dictline1 in dictreader1: for dictline2 in dictreader2: if dictline1['PART CODE'] == dictline2['\xef\xbb\xbfPART_CODE']: dictline2['VB'] = dictline1['ON-HAND'] else: dictline2['VB'] = "0" vblist.append(dictline2) def mainfunc(dictreader1, dictreader2): dictreader2 = list(dictreader2) for dictline1 in dictreader1: for dictline2 in dictreader2: if dictline1['PART CODE'] == dictline2['\xef\xbb\xbfPART_CODE']: dictline2['MAIN'] = dictline1['ON-HAND'] else: dictline2['MAIN'] = "0" mainlist.append(dictline2) vbfunc(vb,inv) #mainfuc(main,inv) #I'll get to this when the other function works for i in vblist: print i['VB'] #complains of KeyError: VB </code></pre> <p>1st problem:</p> <pre><code>if dictline1['PART CODE'] == dictline2['\xef\xbb\xbfPART_CODE']: dictline2['VB'] = dictline1['ON-HAND'] else: dictline2['VB'] = "0" </code></pre> <p>When it's added to the list, it treats every result as "0", if I omit the else: dictline2['VB'] = "0" part, it reports as expected. But if not left in, it will later complain of KeyError: 'VB' when I try to print i['VB']</p> <p>2nd problem:</p> <pre><code>for i in vblist: print i['VB'] #complains of KeyError: VB </code></pre> <p>As stated, complains of a KeyError. If I simply do print i, it displays that the key/value for i is there, it'll report 'VB': '0', etc.</p> <p>I'm still very green to programming, been at this hours a night for a week and I've become discouraged. But not enough to give up!</p>
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    1. COI'm not sure I fully understand your question. You have your inv file, which has an 'ON-HAND' column. Am I correct in interpreting your question to mean you want to fill a 'PART CODE' column with results from either main or vb, depending on which shares the ON-HAND value with inv?
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      1. USKyle Hannon
    2. COINV does *not* have an on-hand, dictline2['VB'] = dictline1['ON-HAND'] is adding a dictionary key & value to the line from INV.
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    3. COIf you're going to be working with tabular data, you should check out the [pandas](http://pandas.pydata.org) library. It makes merging and aligning data much easier.
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      1. USDSM
 

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