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'). ... <看更多>

... <看更多>

from itertools import product >>> m.groupby(['rating', 'gender']).size().to_frame('count').reset_index().merge( pd.DataFrame(list(set([i for ... ... <看更多>

Take the following dataframe: df = pd.DataFrame({'ID':[1,2,1,1,2,3,4,4,4], 'Litmus':[False,False,True,True,False,False,True,True,True]}) I ... ... <看更多>

Sep 30, 2020 - In this tutorial, you will learn how to use Pandas to count occurrences in a column using the value_counts() method & the groupby() method. ... <看更多>