/Python/Find sum of values in a column that corresponds to unique vallues in another coulmn python

Find sum of values in a column that corresponds to unique vallues in another coulmn python

group = df.groupby('author')

df2 = group.apply(lambda x: x['subreddit'].unique())

# Alternatively, same thing as a one liner:
# df2 = df.groupby('author').apply(lambda x: x['subreddit'].unique())

Source: stackoverflow.com

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