Convert all print statements in the docs.
diff --git a/Doc/library/gdbm.rst b/Doc/library/gdbm.rst
index ce27f6c..f69e667 100644
--- a/Doc/library/gdbm.rst
+++ b/Doc/library/gdbm.rst
@@ -93,7 +93,7 @@
 
       k = db.firstkey()
       while k != None:
-          print k
+          print(k)
           k = db.nextkey(k)