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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def getItemsURL(self):
 """Used in stickers_preview.pt """

        req_items = self.get_uids()
        req_items = req_items or [api.get_uid(self.context)]
        req = "{}?items={}".format(self.request.URL, ",".join(req_items))
        return req