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Параметр fill_method позволяет задавать способ замены значений NaN. Этот параметр присутствует во множестве методов — pct_change, diff, и т.д. У метода fillna() он зовется просто method.

— forward-fill (ffill): «протащить» последнее действительное значение вперед;
— backfill (bfill): использовать следующее действительное наблюдение для заполнения пробела;
— zero-fill (zfill): заполнить пробелы нулями
— None: не обрабатывать пропуски

Важное примечание: существует отдельный метод pandas.DataFrame.pad(), он по умолчанию заливает в пустую ячейку последнее валидное значение.

Python: задачки и вопросы
Параметр fill_method позволяет задавать способ замены значений NaN. Этот параметр присутствует во множестве методов — pct_change, diff, и т.д. У метода fillna() он зовется просто method.

— forward-fill (ffill): «протащить» последнее действительное значение вперед;
— backfill (bfill): использовать следующее действительное наблюдение для заполнения пробела;
— zero-fill (zfill): заполнить пробелы нулями
— None: не обрабатывать пропуски

Важное примечание: существует отдельный метод pandas.DataFrame.pad(), он по умолчанию заливает в пустую ячейку последнее валидное значение.
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Параметр fill_method позволяет задавать способ замены значений NaN. Этот параметр присутствует во множестве методов — pct_change

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