Index: zipfile.py
===================================================================
--- zipfile.py	(revision 74191)
+++ zipfile.py	(working copy)
@@ -718,6 +718,12 @@
                 self.fp = None
             raise RuntimeError, 'Mode must be "r", "w" or "a"'
 
+    def __enter__(self):
+        return self
+    
+    def __exit__(self, type, value, traceback):
+        self.close()
+
     def _GetContents(self):
         """Read the directory, making sure we close the file if the format
         is bad."""