The first batch of changes recommended by the fixdiv tool.  These are
mostly changes of / operators into //.  Once or twice I did more or
less than recommended.
diff --git a/Lib/dumbdbm.py b/Lib/dumbdbm.py
index e508349..287a8a0 100644
--- a/Lib/dumbdbm.py
+++ b/Lib/dumbdbm.py
@@ -87,7 +87,7 @@
 ## Does not work under MW compiler
 ##              pos = ((pos + _BLOCKSIZE - 1) / _BLOCKSIZE) * _BLOCKSIZE
 ##              f.seek(pos)
-        npos = ((pos + _BLOCKSIZE - 1) / _BLOCKSIZE) * _BLOCKSIZE
+        npos = ((pos + _BLOCKSIZE - 1) // _BLOCKSIZE) * _BLOCKSIZE
         f.write('\0'*(npos-pos))
         pos = npos