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The simplest way to get row counts per group is by calling .size(), which returns a Series:
df.groupby(['col1','col2']).size()
Usually you want this result as a DataFrame (instead of a Series) so you can do:
df.groupby(['col1', 'col2']).size().reset_index(name='counts')
If you want to find out how to calculate…
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Mike Young -
Mike Young -
Mike Young -
Mike Young -
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