Additional properties are not allowed ('prompt_number' was unexpected) Failed validating 'additionalProperties' in code_cell: On instance['cells'][3]: {'cell_type': 'code', 'execution_count': None, 'metadata': {'collapsed': False}, 'outputs': ['...0 outputs...'], 'prompt_number': '', 'source': 'def ff(f, a):\n return f(a)'}
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