Create a new bidirectional map bm and insert the pair (42, "forty-two")
New implementation

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Other implementations
import com.google.common.collect.BiMap;
import com.google.common.collect.HashBiMap;
BiMap<Integer, String> bm = HashBiMap.create();
bm.put(42, "forty-two");
import bidict
bm = bidict.bidict({42: 'forty-two'})