TIL you can hash None in Python Recently I saw some Python code which looked something like: d = { None: "value", "another_key": "another_value", } It had never really occurred to me you could use None (null) as a key to a dictionary before. What this also meant is that None must be hashable as only hashable objects can be keys in a dictionary. These objects include strings, tuples, sets but don’t include lists as they are mutable and not hashable....