replace string with python
ped = open('/data/bbl/bbl/bbl/ped/nnped.txt')
try:
peds = ped.readlines()
finally:
ped.close()
outfile = open('/data/bbl/bbl/bbl/ped/pedxin.txt', 'w')
for ped in peds:
for i in range(0, 605997):
this_snp = ped[i*4] + ped[i*4 + 1] + ped[i*4 + 2]
outfile.write(this_snp + '\t')
outfile.write('\n')