encrypt and descrypt a created file

[frendy zhang]

if form.accepts(request.vars,session):         for table in db.tables:             rows=db(db[table].id).select()             print rows             open(str(os.sep).join([os.getcwd(), 'applications',                 request.application, 'databases',                 table+'.csv']),'w').write(str(db(db[table].id).select ())) 
 
 
How can i encrypt and descrypt the created file above??
 
thanks in advance...
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