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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 addrs_for_hash(self, h):
 """ Returns addresses that contain expressions that contain a variable with the hash of `h`. """

        if h not in self._hash_mapping:
            return

        self._mark_updated_mapping(self._hash_mapping, h)

        to_discard = set()
        for e in self._hash_mapping[h]:
            try:
                if h == hash(self[e].object): yield e
                else: to_discard.add(e)
            except KeyError:
                to_discard.add(e)
        self._hash_mapping[h] -= to_discard