def print_sell_registry(self):
d = Printer()
doc = d.sell_registry()
response.headers["Content-type"] = "application/vnd.ms-excel"
response.headers["Content-disposition"] = "attachment; filename=%s" % "rejestr_sprzedazy.xls"
content = doc.getvalue()
response.headers["Content-Length"] = str(len(content))
doc.close()
return content
