Question

I’m new to Python and running into a heap of problems and I need some help. I have a python function that needs to parse through some simple values with 0s and 1s.

 111000111
 111000111
 101111111
 101100001
 111111111

I need to store each 0s with a 2D array so the positions can be referenced later. But I’m getting a index out of range, what am I doing wrong and how to fix it?

Here’s the python code:

def storeSubset(fileName):
locale = dataParser(fileName); test = [];
subset = []; subSetCount = 0; columnCt =0;
rowList = []; columnList=[];
for rowCount in range(0, len(locale)):
#   print " "; print " "
#   print "Values of one row locale[row]: ", locale[rowCount]; 
#   print "We are at row# 'row': ", rowCount;
#   print "Length of row is int(len(locale[rowCount]))", int(len(locale[rowCount]));
    test = locale[rowCount];

    for columnCount in range (0, int(len(locale[rowCount])-1)):
        rowVal = locale[rowCount][columnCount];
#       print "Value of column is :", rowVal;
        if (rowVal==0):
#           print "columnVal = 0, the column position is ", columnCount;
            subset[subSetCount].append(rowList[rowCount]);
            subset[subSetCount].append(rowList[columnCount]);
subSetCount+=1;
print "The Subsets is :", subset;
return subset;

Answer 1

When you have subset[subSetCount], subset is still an empty list, so the index is out of range. The same is true for rowList[rowCount] and rowList[columnCount].

From here, I’ll speculate a little about what you’re trying to do to help you fix it. It seems like maybe instead of

subset[subSetCount].append(rowList[rowCount]);
subset[subSetCount].append(rowList[columnCount]);

you just want

rowList.append( rowCount )
columnList.append( columnCount )

Then, after the for columnCount loop, maybe you want

subset.append( [rowList, columnList] )

or something like that.