Series.ffill()

pandas.Series.ffill

Series.ffill(axis=None, inplace=False, limit=None, downcast=None)

Synonym for NDFrame.fillna(method=’ffill’)

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© 2008–2014 the pandas development team
Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.Series.ffill.html