There is a Pandas dataframe: userId movieId rating timestamp 0 1 31 2.5 1260759144 1 1 1029 3.0 1260759179 2 1 1061 3.0 1260759182 3 1 1129 2.0 1260759185 4 1 1172 4.0 1260759205 leave in this dataframe only users who have rated 100 or more in the rating column

import pandas as pd

df = pd.read_csv('ratings.csv')

grouped = df.groupby('userId')

top_users = grouped.filter(lambda x: len(x) >= 100)