pandas.core.groupby.DataFrameGroupBy.count
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DataFrameGroupBy.count() -
Compute count of group, excluding missing values
© 2008–2012, AQR Capital Management, LLC, Lambda Foundry, Inc. and PyData Development Team
Licensed under the 3-clause BSD License.
https://pandas.pydata.org/pandas-docs/version/0.18.1/generated/pandas.core.groupby.DataFrameGroupBy.count.html
