Web Reference: Nov 7, 2012 · You're trying to use a dict as a key to another dict or in a set. That does not work because the keys have to be hashable. As a general rule, only immutable objects (strings, integers, floats, frozensets, tuples of immutables) are hashable (though exceptions are possible). So this does not work: >>> some_dict[dict_key] = True . Jul 23, 2025 · In Python, the "Type Error" is an exception and is raised when an object's data type is incorrect during an operation. In this article, we will see how we can handle TypeError: Unhashable Type 'Dict' Exception in Python. Dec 6, 2025 · Learn how to resolve the Python TypeError: unhashable type 'dict' error by understanding hashability and converting dictionaries to immutable types like tuples.
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