Bring pandas up to date #4
Description
Include named aggregation (https://pandas-docs.github.io/pandas-docs-travis/user_guide/groupby.html#named-aggregation), query, assign and the fluent style in general.
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Include named aggregation (https://pandas-docs.github.io/pandas-docs-travis/user_guide/groupby.html#named-aggregation), query, assign and the fluent style in general.