|   | 1 |  initial version  | 
I agree with @ppurka explanation, and the workaround to have the preparser work in a ipython shell (or notebook) is to type:
%load_ext sage.misc.sage_extension
as suggested here
|   | 2 |  No.2 Revision  | 
I agree with @ppurka explanation, explanation (i was going to answer along the same lines before his/her solution appears ;) and the workaround to have the preparser work in a ipython shell (or notebook) is to type:
%load_ext sage.misc.sage_extension
as suggested here
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                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.