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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 get_deliveryservers(self, domainid, page=None):
 """Get a domains delivery servers"""

        opts = {}
        if page:
            opts['page'] = page
        return self.api_call(
            ENDPOINTS['deliveryservers']['list'],
            dict(domainid=domainid), **opts)