Web Reference: Nov 7, 2012 · This error occurs if you try to use a dictionary as a key for another dictionary (e.g. {{}: 1}) or add a dictionary to a set (e.g. {{}}) or check if a dict exists in set/dict_keys (e.g. {} in set()) or use a column of dicts as a grouper in pandas groupby. 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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