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From: Dave Angel <davea@davea.name>
Subject: Re:generate De Bruijn sequence memory and string vs lists
Date: Thu, 23 Jan 2014 11:18:41 -0500 (EST)
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Xref: csiph.com comp.lang.python:64621

 Vincent Davis <vincent@vincentdavis.net> Wrote in message:
> 
(something about your message seems to make it unquotable)

64gig is 4^18, so you can forget about holding a string of size 4^50

If memory size is your issue,  why not make the function a
 generator,  by replacing the append with a yield?
 

-- 
DaveA