diff --git a/Demo/threads/Coroutine.py b/Demo/threads/Coroutine.py
index 0cf9255..4cc65f7 100644
--- a/Demo/threads/Coroutine.py
+++ b/Demo/threads/Coroutine.py
@@ -138,10 +138,9 @@
 
     def tran(self, target, data=None):
         if not self.invokedby.has_key(target):
-            raise TypeError, '.tran target ' + `target` + \
-                             ' is not an active coroutine'
+            raise TypeError, '.tran target %r is not an active coroutine' % (target,)
         if self.killed:
-            raise TypeError, '.tran target ' + `target` + ' is killed'
+            raise TypeError, '.tran target %r is killed' % (target,)
         self.value = data
         me = self.active
         self.invokedby[target] = me
@@ -153,7 +152,7 @@
             if self.main is not me:
                 raise Killed
             if self.terminated_by is not None:
-                raise EarlyExit, `self.terminated_by` + ' terminated early'
+                raise EarlyExit, '%r terminated early' % (self.terminated_by,)
 
         return self.value
 
diff --git a/Demo/threads/find.py b/Demo/threads/find.py
index ab581e3..7d5edc1 100644
--- a/Demo/threads/find.py
+++ b/Demo/threads/find.py
@@ -116,7 +116,7 @@
     wq.run(nworkers)
     t2 = time.time()
 
-    sys.stderr.write('Total time ' + `t2-t1` + ' sec.\n')
+    sys.stderr.write('Total time %r sec.\n' % (t2-t1))
 
 
 # The predicate -- defines what files we look for.
@@ -133,7 +133,7 @@
     try:
         names = os.listdir(dir)
     except os.error, msg:
-        print `dir`, ':', msg
+        print repr(dir), ':', msg
         return
     for name in names:
         if name not in (os.curdir, os.pardir):
@@ -141,7 +141,7 @@
             try:
                 stat = os.lstat(fullname)
             except os.error, msg:
-                print `fullname`, ':', msg
+                print repr(fullname), ':', msg
                 continue
             if pred(dir, name, fullname, stat):
                 print fullname
diff --git a/Demo/threads/sync.py b/Demo/threads/sync.py
index a8556c4..1688403 100644
--- a/Demo/threads/sync.py
+++ b/Demo/threads/sync.py
@@ -336,7 +336,7 @@
 
     def broadcast(self, num = -1):
         if num < -1:
-            raise ValueError, '.broadcast called with num ' + `num`
+            raise ValueError, '.broadcast called with num %r' % (num,)
         if num == 0:
             return
         self.idlock.acquire()
@@ -418,7 +418,7 @@
         self.nonzero.acquire()
         if self.count == self.maxcount:
             raise ValueError, '.v() tried to raise semaphore count above ' \
-                  'initial value ' + `maxcount`
+                  'initial value %r' % (maxcount,))
         self.count = self.count + 1
         self.nonzero.signal()
         self.nonzero.release()
diff --git a/Demo/threads/telnet.py b/Demo/threads/telnet.py
index 3c70cb0..707a353 100644
--- a/Demo/threads/telnet.py
+++ b/Demo/threads/telnet.py
@@ -57,7 +57,7 @@
     try:
         s.connect((host, port))
     except error, msg:
-        sys.stderr.write('connect failed: ' + `msg` + '\n')
+        sys.stderr.write('connect failed: %r\n' % (msg,))
         sys.exit(1)
     #
     thread.start_new(child, (s,))
@@ -77,7 +77,7 @@
         for c in data:
             if opt:
                 print ord(c)
-##                              print '(replying: ' + `opt+c` + ')'
+##                              print '(replying: %r)' % (opt+c,)
                 s.send(opt + c)
                 opt = ''
             elif iac:
@@ -101,13 +101,13 @@
                 cleandata = cleandata + c
         sys.stdout.write(cleandata)
         sys.stdout.flush()
-##              print 'Out:', `cleandata`
+##              print 'Out:', repr(cleandata)
 
 def child(s):
     # read stdin, write socket
     while 1:
         line = sys.stdin.readline()
-##              print 'Got:', `line`
+##              print 'Got:', repr(line)
         if not line: break
         s.send(line)