DataFrameGroupBy.count()
pandas.core.groupby.DataFrameGroupBy.count
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DataFrameGroupBy.count()
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Compute count of group, excluding missing values
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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.core.groupby.DataFrameGroupBy.count.html