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