upgrade to python3;add some validator examples

scripts/compare-file.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys, string, hashlib, os
 from stat import *
@@ -9,9 +9,9 @@ def check_file(name, size, md5sum):
     m = hashlib.md5()
     if os.path.isfile(name):
         s = os.stat(name)[ST_SIZE]
-        if s == string.atoi(size):
+        if s == int(size):
             f = open(name, 'rb')
-            m.update(f.read(string.atoi(size)))
+            m.update(f.read(int(size)))
             f.close()
             d = m.hexdigest()
             result.write("%s %d %s\n" % (name, s, d))
@@ -26,9 +26,10 @@ if __name__ == '__main__':
     result = open(sys.argv[3], 'w+')
     fstdout = open(sys.argv[2], 'r')
     for line in fstdout:
-        name, size, md5sum = string.split(string.strip(line), ' ')
+        name, size, md5sum = line.strip().split(' ')
         if not check_file(name, size, md5sum):
-            print 'WA'; break
+            print('WA')
+        break
     fstdout.close()
     result.close()
-    print 'AC'
+    print('AC')