upgrade to python3;add some validator examples

python/judgescript.py

@@ -23,20 +23,23 @@ class InternalJudge:
         return self.compare_file(tin, tout, result, self.allowpe)
 
     def compare_file(self, input, output, result, allowpe):
-        fo = file(output, 'rb'); fr = file(result, 'rb')
+        with open(output, 'rb') as fo, open(result, 'rb') as fr:
 
-        if not allowpe:
-            r = 'AC'
-            while r == 'AC':
-                so = fo.read(8192); sr = fr.read(8192)
-                if so == '' and sr == '': break
-                if so != sr: r = 'WA'
-        else:
-            so = fo.read(); sr = fr.read()
-            r = self.compare_string(so, sr)
-
-        fo.close(); fr.close()
-        return r
+            if not allowpe:
+                r = 'AC'
+                while r == 'AC':
+                    so = fo.read(8192)
+                    sr = fr.read(8192)
+                    if so == b'' and sr == b'':
+                        break
+                    if so != sr:
+                        r = 'WA'
+            else:
+                so = fo.read()
+                sr = fr.read()
+                r = self.compare_string(so.decode('utf-8', errors='ignore'),
+                                        sr.decode('utf-8', errors='ignore'))
+            return r
     
     def compare_string(self, output, result):
         if output == result: return 'AC'
@@ -76,10 +79,10 @@ class ExternalJudge:
             os.makedirs(datadir)
         self.comparecmd = tester.comparecmd
         self.codefile = os.path.abspath(os.path.join(datadir, tester.source))
-        f = file(self.codefile, 'w')
-        f.write(string.replace(vcode, '\r\n', '\n'))
-        if len(vcode) > 0 and vcode[-1] != '\n': f.write('\n')
-        f.close()
+        with open(self.codefile, 'w') as f:
+            f.write(string.replace(vcode, '\r\n', '\n'))
+            if len(vcode) > 0 and vcode[-1] != '\n':
+                f.write('\n')
 
         self.logger.debug("Save validator code as %s" % self.codefile)
 
@@ -119,7 +122,7 @@ class ExternalJudge:
 
             if rundir: os.chdir(rundir)
             os.execv(cmd[0], cmd)
-            print 'WA'
+            print('WA')
 
         remaintime = self.config.judgescript_wait
         pid1 = 0
@@ -133,13 +136,12 @@ class ExternalJudge:
         while pid1 == 0:
             try:
                 os.kill(pid, 9)
-            except os.OSError, e:
+            except OSError:
                 pass
             pid1, status = os.waitpid(pid, os.WNOHANG)
         
-        f = file(rfile, 'r')
-        ret = string.strip(f.readline())
-        f.close()
+        with open(rfile, 'r') as f:
+            ret = f.readline().strip()
         if ret != 'AC' and ret != 'PE': ret = 'WA'
         return ret
 
@@ -268,7 +270,7 @@ public class Main {
     def testPython(self):
         code = """#!/usr/bin/env python
 
-print 'AC'
+print('AC')
 """
         self.j = ExternalJudge('p1', 'python-2.5', code)
         x = self.j.judge('s1', 't1', self.tin.name, self.tout.name, self.rst.name, self.err.name)