Maximum List size (item number) limit?

[bearophileHUGS at lycos.com]

Juho Schultz
>NIR_mean_l only from lines 1, 4, 7, ...
>R_mean_l only from lines 2, 5, 8, ...
>G_mean_l only from lines 3, 6, 9, ...

This can be the problem, but it can be right too.
The following code is shorter and I hope cleaner, with it maybe
Kriston-Vizi Janos can fix his problem.

class ReadData:
    def __init__(self, filename):
        self.NIR_mean = []
        self.NIR_stdev = []
        self.R_mean = []
        self.R_stdev = []
        self.G_mean = []
        self.G_stdev = []
        self.area = []

        for line in file(filename):
            row = line.split()
            self.area.append(row[1])
            self.NIR_mean.append(row[2])
            self.NIR_stdev.append(row[3])
            self.R_mean.append(row[4])
            self.R_stdev.append(row[5])
            self.G_mean.append(row[6])
            self.G_stdev.append(row[7])

# -------------------------------
L = ReadData('L.txt')
GC = ReadData('GC.txt')
out_file = file('merged.txt', 'w')

# Create output rows from lists
for i in xrange(len(L.NIR_mean)): # Process all input rows

    # Filter L and GC rows by area values
    if (10000 <= float(L.area[i]) <= 100000) and \
       (10000 <= float(GC.area[i]) <= 100000):

        # Create output line and write out
        newline = [str(i+1)]
        for obj in L, GC:
            newline.extend([obj.NIR_mean[i], obj.NIR_stdev[i],
                            obj.R_mean[i],   obj.R_stdev[i],
                            obj.G_mean[i],   obj.G_stdev[i],
                            obj.area[i]])
        outline =  '\t'.join(newline) + '\n'
        out_file.write(outline)

out_file.close()