<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def import_from(self, other_ns, replace=False):
 """Imports namespaces into this set, from other_ns. Args: other_ns (NamespaceSet):
 The set to import from replace (bool):
 If a namespace exists in both sets, do we replace our data with other_ns's data? We could get fancy and define some merge strategies, but for now, this is very simple. It's either do nothing, or wholesale replacement. There is no merging. Raises: DuplicatePrefixError: If the other NamespaceSet is mapping any prefixes incompatibly with respect to this set. """

        for other_ns_uri in other_ns.namespace_uris:
            ni = self.__ns_uri_map.get(other_ns_uri)

            if ni is None:
                other_ni = other_ns._NamespaceSet__ns_uri_map[other_ns_uri]

                # Gotta make sure that the other set isn't mapping its prefixes
                # incompatibly with respect to this set.
                for other_prefix in other_ni.prefixes:
                    self.__check_prefix_conflict(other_ns_uri, other_prefix)

                cloned_ni = copy.deepcopy(other_ni)
                self.__add_namespaceinfo(cloned_ni)
            elif replace:
                other_ni = other_ns._NamespaceSet__ns_uri_map[other_ns_uri]
                for other_prefix in other_ni.prefixes:
                    self.__check_prefix_conflict(ni, other_prefix)

                cloned_ni = copy.deepcopy(other_ni)
                self.remove_namespace(other_ns_uri)
                self.__add_namespaceinfo(cloned_ni)
            else:
                continue