Exception is raised when trying to perform an operation on a closed HDFStore file.
Examples
>>> store = pd.HDFStore('my-store', 'a')
>>> store.close()
>>> store.keys()
... # ClosedFileError: my-store file is not open!
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https://pandas.pydata.org/pandas-docs/version/2.3.0/reference/api/pandas.errors.ClosedFileError.html