Python ASCII Reading tables -

i'm sorry asking silly question have spend half day , not find reasonable solution. have ascii file:

      "x"           "z"             "y"    285807.2      -1671.056        2405.91    285807.2      -1651.162       2394.932    285807.2      -1631.269       2383.962    285807.2      -1611.375       2372.988    285807.2      -1591.481        2362.01    285807.2      -1571.587       2351.01 

............................................. ~1 000 000 rows

and normaly read it:

from astropy.io import ascii  data =ascii.read('c:\\users\\protoss\\desktop\\ishodnik1.dat') print (data) 

but how deal columns? instance sum each rows or make average value, etc columns z , y? understand have converts date list of float valuse except headliner , write new ascii file, doesn't it?

what did. separated columns , added different lists. have got access different columns:

import numpy np     open('c:\\users\\protoss\\desktop\\ishodnik.dat' ,'r') f:         header1 = f.readline()             x_list=[]         z_list=[]         v_list=[]         line in f:             line = line.strip()             columns = line.split()             x = (float(columns[0]))             z = (float(columns[1]))             v = (float(columns[2]))             x_list.append(x)             z_list.append(z)             v_list.append(v)