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/pandas 0.23

pandas.Series.count

Series.count(level=None) [source]

Return number of non-NA/null observations in the Series

Parameters:

level : int or level name, default None

If the axis is a MultiIndex (hierarchical), count along a particular level, collapsing into a smaller Series

Returns:
nobs : int or Series (if level specified)

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Licensed under the 3-clause BSD License.
http://pandas.pydata.org/pandas-docs/version/0.23.4/generated/pandas.Series.count.html