pandas.Panel.to_sparse
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Panel.to_sparse(fill_value=None, kind='block') -
Преобразовать в SparsePanel
Параметры: fill_value : float, по умолчанию NaN
kind : {‘block’, ‘integer’}
Возвращает: y : SparseDataFrame
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Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Panel.to_sparse.html
