Raise statement normalization in Lib/test/.
diff --git a/Lib/test/test_thread.py b/Lib/test/test_thread.py
index 5705798..577d4cb 100644
--- a/Lib/test/test_thread.py
+++ b/Lib/test/test_thread.py
@@ -108,7 +108,7 @@
 
 print('\n*** Barrier Test ***')
 if done.acquire(0):
-    raise ValueError, "'done' should have remained acquired"
+    raise ValueError("'done' should have remained acquired")
 bar = barrier(numtasks)
 running = numtasks
 for i in range(numtasks):
@@ -119,11 +119,11 @@
 # not all platforms support changing thread stack size
 print('\n*** Changing thread stack size ***')
 if thread.stack_size() != 0:
-    raise ValueError, "initial stack_size not 0"
+    raise ValueError("initial stack_size not 0")
 
 thread.stack_size(0)
 if thread.stack_size() != 0:
-    raise ValueError, "stack_size not reset to default"
+    raise ValueError("stack_size not reset to default")
 
 from os import name as os_name
 if os_name in ("nt", "os2", "posix"):
@@ -143,7 +143,7 @@
         for tss in (262144, 0x100000, 0):
             thread.stack_size(tss)
             if failed(thread.stack_size(), tss):
-                raise ValueError, fail_msg % tss
+                raise ValueError(fail_msg % tss)
             print('successfully set stack_size(%d)' % tss)
 
         for tss in (262144, 0x100000):