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POPython table classification
 

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    <p>I have text file(test.data), which include some values and class name, for example</p> <pre><code>4.5,3.5,U1 4.5,10.5,U2 4.5,6,U1 3.5,10.5,U2 3.5,10.5,U2 5,7,U1 7,6.5,U1 </code></pre> <p>I need to classify this data to rows(matrix), where 1,2 row etc is data, last one is class. So I started with this code:</p> <pre><code>reader = csv.reader(open('test.data', 'r')) result = [] for row in reader: result.append(row) print result </code></pre> <p>output:</p> <pre><code>[['4.5', '3.5', 'U1'], ['4.5', '10.5', 'U2'], ['4.5', '6', 'U1'], ['3.5', '10.5', 'U2'], ['3.5', '10.5', 'U2'], ['5', '7', 'U1'], ['7', '6.5', 'U1']] </code></pre> <p>This all work ok, but now I need from this data make matrix classification. In this case I want to make matrix:</p> <pre><code>test data=[data1, data2,.....,class name1] test data2=[data1, data2,.....,class name2]... </code></pre> <p>I need this "matrix"<strong>(test data,test data2)</strong>, because I will then choose from every <strong>test data</strong> just <strong>2/3</strong> data which will be named "<strong>choosen</strong>", other 1/3 data must stay in test data,....</p> <p>So what I need as output:</p> <pre><code>choosen=[data,data,......class name1] # 2/3 from every **test.data** test data=[data1, data2,.....,class name1] # other 1/3 from test data test data2=[data1, data2,.....,class name1] # other 1/3 from test data 2 </code></pre> <blockquote> <p>.</p> <p>. . . .</p> </blockquote> <p>.</p> <p>Many thanks for help</p> <hr> <p><strong>EDIT2:</strong></p> <p>If I use your code I get:</p> <pre><code>{ 'U1': [ ['4.5','3.5'], ['4.5','6'], ['5','7'], ['7','6.5'] ], 'U2': [ ['4.5','10.5'], ['3.5','10.5'], ['3.5','10.5'] ] } </code></pre> <p>But I don't have everytime this data: </p> <pre><code>4.5,3.5,U1 4.5,10.5,U2 4.5,6,U1 3.5,10.5,U2 3.5,10.5,U2 5,7,U1 7,6.5,U1 </code></pre> <p>I have also: </p> <pre><code>4.5,3.5,4.5,10.5, U1 3.5,10.5,3.5,10.5,U2 4.5,12.5,3.5,12.5,U2 </code></pre> <p>...... (so I don't know that class is on second row as you write on your code), but I know that last row is CLASS</p> <p>So how can I change your code:</p> <pre><code>reader = csv.reader(open('test.data', 'r')) result = {} for row in reader: uclass=row[2] #-------&gt; must be last row not second !!!! if result.has_key(uclass): result[uclass].append([row[0],row[1]]) #----&gt;not just 2 row's, on other data I have for example 5 rows.. else: result[uclass]=[[row[0],row[1]]] #----&gt;not just 2 row's, on other data I have for example 5 rows.. print repr(result) </code></pre>
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    1. COTo me it's really not clear what you are trying to do. Can you provide an explanation of the second part of the question using the data shown as example in the first? What would be the result you are looking for given the input data `4.5,3.5,U1...` ?
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    2. COFYI: pythonese for "last element in list" is someList[-1] and "all but the last element" may be expressed as someList[0:-1]. This will works for strings as well: `"abcde"[0:-1]="abcd"` and `"abcde"[-1]="e"`
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