对列的pandas值求和并删除重复的值

import pandas as pd

data = {'values': [1, 2, 3, 4, 2, 3, 4]}
df = pd.DataFrame(data)

df_sum = df.groupby('values').sum()

df_unique = df_sum.drop_duplicates()

import pandas as pd

data = {'values': [1, 2, 3, 4, 2, 3, 4]}
df = pd.DataFrame(data)

df_sum = df.groupby('values').sum()
df_unique = df_sum.drop_duplicates()

print(df_unique)