Dear All What i want to do is , my input is like 0 2 0 3 0 4 1 2 1 4 2 3 3 4
I am comparing and put the number in group , like ,the first three lines , all has zero as first input for each line, so the out put should look like 0 2 3 4 and so on 1 2 4 2 3 3 4 I managed to do what i need , but i did in this case , there is no space between numbers , like 02 03 04 12 14 23 34 so , how can i do this with spaces between numbers This is my code def belong_to(x,a): c=-1 for i in range(len(a)-1): if x==int(a[i]): c=i return c def list_belong(x,a): # This function to check if this line c=-1 # line has been searched before or not for i in range(len(a)): if a[i]==x: c=1 break return c x=0 occur=[] in_file=open('data.dat','r') out_file=open('result.dat','w') fileList = in_file.readlines() for k in fileList: v=k occur.append(k) n=len(v)-1 for i in range(n): temp=int(v[i]) print temp, out_file.write(str(temp)) for line in fileList: if v!=line: if list_belong(line,occur)!=1: if belong_to(temp,line) != -1: j=belong_to(temp,line) for i in range(len(line)-1): if i!=j: print line[i], out_file.write(line[i]) print out_file.write("\n") out_file.close() in_file.close() -- http://mail.python.org/mailman/listinfo/python-list