PYTHON : TypeError: unhashable type: 'dict', when dict used as a key for another dict

Описание: PYTHON : TypeError: unhashable type: 'dict', when dict used as a key for another dict
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PYTHON : TypeError: unhashable type: 'dict', when dict used as a key for another dict
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: type: TypeError: a PYTHON as when used for dict another dict 'dict', key unhashable