import os

import os.path

import re

os.chdir('D:Cancer DataAcute Myeloid eukemia—dataDNA_Methylation')

f=open('jhu-usc.edu_LAML.HumanMethylation450.2.lvl-3.TCGA-AB-2802-03A-01D-0741-05.txt','r')

fy=open('cancer chrY mC position','w+')

line=f.readlines()

matchpattern=re .compile(r'^Y$')

for line0 in line:

   line_0=line0.split()

   if matchpattern.search(line_0[3]):

       fy.write(line0)

f.close()

fy.close()