move import into function to avoid having to add an __all__ list...
diff --git a/Lib/whichdb.py b/Lib/whichdb.py
index 4396321..1f12099 100644
--- a/Lib/whichdb.py
+++ b/Lib/whichdb.py
@@ -1,7 +1,5 @@
 """Guess which db package to use to open a db file."""
 
-import struct
-
 def whichdb(filename):
     """Guess which db package to use to open a db file.
 
@@ -15,6 +13,8 @@
     database using that module may still fail.
     """
 
+    import struct
+
     # Check for dbm first -- this has a .pag and a .dir file
     try:
         f = open(filename + ".pag", "rb")