DataFrame.first_valid_index()
pandas.DataFrame.first_valid_index
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DataFrame.first_valid_index()
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Return label for first non-NA/null value
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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.DataFrame.first_valid_index.html