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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 portalSelf(self):
 """The portal to which the current user belongs. This is an organizational portal if the user belongs to an organization or the default portal if the user does not belong to one"""

        url = "%s/self" % self.root
        return Portal(url=url,
                      securityHandler=self._securityHandler,
                      proxy_url=self._proxy_url,
                      proxy_port=self._proxy_port,
                      )