He group, 

i create serial letters with web2py and pdfLatex. It works fine with a 
static csv-file in private folder. 
But i want to create the csv and save directly to the folder. No Download!

I create the csv ... no Problem:

@auth.requires_login()
def create_csv():
    from gluon.contenttype import contenttype
    import os
    response.headers['Content-Type'] = contenttype('.csv')
    response.headers['Content-disposition'] = 'attachment; 
filename=%s_database.csv' % (
        request.now
        )
    import csv, cStringIO
    s = cStringIO.StringIO()
    db((db.grunddaten.id>0)).select().export_to_csv_file(s, delimiter=',', 
quotechar='"', quoting=csv.QUOTE_NONNUMERIC)
    return s.getvalue()

But how can i save this file directly on my folder?

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