nunique sort
df = df.groupby('A')['B'].nunique().sort_values(ascending=False).reset_index(name='count')
print (df)
A count
0 D 3
1 C 2
2 E 1nunique sort
df = df.groupby('A')['B'].nunique().sort_values(ascending=False).reset_index(name='count')
print (df)
A count
0 D 3
1 C 2
2 E 1Copyright © 2021 Codeinu
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