@abc.abstractmethod<EOL><INDENT>def get_proxy(self, input_):<DEDENT>
return<EOL>
Gets a proxy.

        :param input: a proxy condition
        :type input: ``osid.proxy.ProxyCondition``
        :return: a proxy
        :rtype: ``osid.proxy.Proxy``
        :raise: ``NullArgument`` -- ``input`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``input`` is not of this service

        *compliance: mandatory -- This method is must be implemented.*