Hey there, I'm currently doing data preprocessing (generating lagged values for a time series) and I'm having some difficulties trying to write a file to disk. A friend of mine, wrote this quick example for me: ----------------------------------------------------------------------------------------------------------- array = ['1','2','3','4','5','6','7'] lineSize = 4 skip = 4 condition = 1 startIndex = 0
for letter in array: line = [] startIndex = array.index(letter) for indexNum in range(startIndex, startIndex + (skip - 1), 1): #print "first loop" #print if indexNum > (len(array) - 1): break else: line.append(array[indexNum]) #print "startIndex" #print startIndex + skip for indexNum in range(startIndex + skip, (startIndex + lineSize) + 1, 1): #print "second loop" #print if indexNum > (len(array) - 1): break else: line.append(array[indexNum]) print line ---------------------------------------------------------------------------------------------------------------------- which outputs to the console: ['1', '2', '3', '5'] ['2', '3', '4', '6'] ['3', '4', '5', '7'] ['4', '5', '6'] ['5', '6', '7'] ['6', '7'] ['7'] This is exactly what I want and need, but when modified to read and write files from/to disk, I run into problems. example text file for reading: C:\>more kaka.txt 1 2 3 4 5 6 7 tweaked code: ------------------------------------------------------------------------------------------------------------------- f=open('c:/kaka.txt','r') array=f.readlines() f.close() f=open('c:/kakaDump.txt','w') lineSize = 4 skip = 4 condition = 1 startIndex = 0 for letter in array: line = [] startIndex = array.index(letter) for indexNum in range(startIndex, startIndex + (skip - 1), 1): if indexNum > (len(array) - 1): break else: line.append(array[indexNum]) for indexNum in range(startIndex + skip, (startIndex + lineSize) + 1, 1): if indexNum > (len(array) - 1): break else: line.append(array[indexNum]) f.writelines(line) ------------------------------------------------------------------------------------------------------------------------------- C:\>more kakaDump.txt 1 2 3 5 2 3 4 6 3 4 5 74 5 6 5 6 76 77 For those familiar with neural networks, the input file is a time series and the output file needs to have 3 lagged variables for training and a (two time steps ahead) variable for the target. Ie: input file 1 2 3 4 5 6 7 output file 1 2 3 5 2 3 4 6 3 4 5 7 4 5 6 5 6 7 6 7 7 Thanks in advanced, D. -- http://mail.python.org/mailman/listinfo/python-list