looping through file context in python

#!/usr/bin/env python3
import io
import os

qbfile = open("list.txt", "r")

for aline in qbfile:
    values = aline.split()
    print( values[0] )
    if values[0] =="3" :
                   print("  we found the value %s" % values[0])
qbfile.close()

RESULT

1

2

3

  we found the value 3

4

5

6